Here you must separate the literal reading of cold feet from its idiomatic sense used in daily speech.
So option C fits, because losing nerve right before an event is exactly what having cold feet describes.
Let's summarize:
Recognizing the idiom stops you from picking the literal-sounding distractors.
| Item | Body Part |
|---|---|
| 1 | palm |
| 2 | foot |
| 3 | eye |
| 4 | stomach |
| Item | Meaning |
|---|---|
| 5 | could not tolerate the insult |
| 6 | to look at with envy and desire |
| 7 | to put the blame on someone else |
| 8 | forced to pay the bill |