**Core Concept**
The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a crucial metabolic pathway that occurs in the mitochondria of cells. It plays a central role in cellular respiration, generating energy for the cell through the production of ATP (adenosine triphosphate), NADH, and FADH2.

**Why the Correct Answer is Right**
In the Krebs cycle, one molecule of acetyl-CoA is converted into one molecule of CO2, releasing energy that is captured in the form of GTP (guanosine triphosphate) and NADH. GTP is then converted to ATP, which is the primary energy currency of the cell. For each turn of the Krebs cycle, one GTP molecule is produced, which is equivalent to one ATP molecule. Additionally, the Krebs cycle produces three NADH molecules and one FADH2 molecule, which are used in the electron transport chain to generate more ATP.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because one Krebs cycle generates more than one ATP through the production of GTP, which is then converted to ATP.
**Option B:** This option is incorrect because the Krebs cycle is not directly involved in the production of ATP from glucose.
**Option C:** This option is incorrect because the Krebs cycle produces more than one ATP per cycle, as explained above.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Krebs cycle is a critical step in cellular respiration, and any disruptions to this pathway can have significant effects on energy production in the cell.

**Correct Answer: C. 1**