After a 24 hour fast, which of the following is the major metabolic pathway providing oxidizable substrate for skeletal muscle?

A. Lipolysis

B. Gluconeogensis

C. Ketone body synthesis

D. Glycogenolysis

Answer: I believe the answer would be A. If it is wrong sorry.

Option C, Ketone body synthesis

Explanation:

Ketone bodies are used as a source of energy when glucose is not easily available as energy source. This usually happens when a person is fasting and hence does not intake any glucose. There are three main ketone bodies a) acetoacetate, b) 3-beta-hydroxybutyrate and c) acetone. When our body do not receive food for a long time or a person undergo rigorous and continuous physical exercise, then the level of ketone bodies increases in the blood

Hence, option C is correct