**Core Concept**
Glucose transport into cells is primarily facilitated by a group of proteins called glucose transporters (GLUTs), but in certain tissues, especially the small intestine, it is coupled with the transport of sodium ions. This phenomenon is known as secondary active transport.

**Why the Correct Answer is Right**
In the small intestine, glucose is transported into enterocytes via the glucose transporter 2 (GLUT2). This process is coupled with the transport of sodium ions into the cell through the sodium-glucose cotransporter 1 (SGLT1). The movement of sodium ions down their concentration gradient drives the transport of glucose into the cell against its concentration gradient, a classic example of secondary active transport. This mechanism is essential for the efficient absorption of glucose from the gut lumen.

**Why Each Wrong Option is Incorrect**
**Option B:** Sodium antiport refers to the transport of sodium ions out of a cell, which is not directly related to glucose transport into a cell.
**Option C:** Potassium transport is a separate process that helps maintain the resting membrane potential and is not directly involved in glucose transport.
**Option D:** Amino acid transport is also a separate process, although some amino acids can be transported into cells via sodium-dependent mechanisms, this is not directly related to glucose transport.

**Clinical Pearl / High-Yield Fact**
In the small intestine, the sodium-glucose cotransporter 1 (SGLT1) is responsible for the efficient absorption of glucose from the gut lumen, and its activity is regulated by the presence of glucose and sodium ions.

**✓ Correct Answer: A. Sodium symport**