**Core Concept**
Oxygen delivery to tissue is a critical process that involves the transport of oxygen from the lungs to the mitochondria of cells. This process is influenced by several factors, including hemoglobin concentration, cardiac output, and the partial pressure of oxygen in arterial blood.

**Why the Correct Answer is Right**
The correct answer is related to the concept of oxygen-hemoglobin dissociation curve, which describes the relationship between the partial pressure of oxygen in arterial blood and the saturation of hemoglobin with oxygen. A decrease in pH (acidosis) shifts the curve to the right, making it easier for hemoglobin to release oxygen to tissues. However, if a condition increases the pH (alkalosis) of the blood, it shifts the curve to the left, making it more difficult for hemoglobin to release oxygen to tissues.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not related to the decrease in oxygen delivery to tissue.
* **Option B:** This option is not directly related to the decrease in oxygen delivery to tissue.
* **Option C:** This option is not correct because it does not directly affect oxygen delivery to tissue.

**Clinical Pearl / High-Yield Fact**
A decrease in oxygen delivery to tissue can lead to tissue hypoxia, which can result in the production of lactic acid and the release of various inflammatory mediators.

**Correct Answer:** A. Alkalosis.