**Core Concept:**
The question is testing the understanding of the relationship between glycolytic activity and oxygen transport by haemoglobin. Glycolysis is the initial step in glucose breakdown, and it generates energy (ATP) and key molecules such as pyruvate. Haemoglobin is a protein in red blood cells (RBCs) that binds oxygen to transport it throughout the body.

**Why the Correct Answer is Right:**
Glycolytic activity, or the rate of glucose breakdown in the cell, is crucial for the production of ATP, which is essential for maintaining the function of RBCs. In particular, glycolysis generates molecules like pyruvate that are involved in maintaining the stability of haemoglobin (Hb).

**Why Each Wrong Option is Incorrect:**
A. This option is incorrect because decreased glycolytic activity does not directly affect the oxygen-binding affinity of haemoglobin. Although glycolysis indirectly contributes to maintaining RBC function, the primary role of glycolysis is energy production for cells, not haemoglobin stability.
B. This option is incorrect because the primary function of glycolysis is energy production, not directly influencing haemoglobin stability. Although glycolysis indirectly affects RBC function, it does not directly impact haemoglobin's ability to bind oxygen.
C. This option is incorrect because the primary function of glycolysis is energy production, not directly influencing haemoglobin stability. Although glycolysis indirectly affects RBC function, it does not directly impact haemoglobin's ability to bind oxygen.
D. This option is incorrect because the primary function of glycolysis is energy production, not directly influencing haemoglobin stability. Although glycolysis indirectly affects RBC function, it does not directly impact haemoglobin's ability to bind oxygen.

**Core Concept:**
Haemoglobin is a protein found in red blood cells (RBCs) that carries oxygen from the lungs to the body's tissues and releases it to meet the cells' demand for oxygen. Haemoglobin is composed of four polypeptide chains: α2β2. Each haemoglobin molecule binds to four molecules of oxygen, with the binding affinity being influenced by pH, partial pressure of oxygen, and the presence of other molecules like 2,3-bisphosphoglycerate (2,3-BPG), which helps stabilize the haemoglobin-oxygen complex and increase its affinity for oxygen.

**Why the Correct Answer is Right:**
Increased glycolytic activity leads to increased production of ATP, which provides energy for RBC function and helps maintain 2,3-bisphosphoglycerate (2,3-BPG) levels. 2,3-BPG is a key molecule in the RBCs that stabilizes the haemoglobin-oxygen complex and enhances its affinity for oxygen. Therefore, increased glycolytic activity leads to higher levels of 2,3-BPG in RBCs, which enhances haemoglobin's ability to bind oxygen and improve oxygen transport efficiency.

**Why Other Options Are Incorrect:**
Option A: Haemoglobin's oxygen-binding affinity is primarily influenced by 2,3-BPG levels, not glycolytic activity. Glycolytic activity primarily contributes to energy production and 2,3-BPG