Select the idiom that can substitute the highlighted group of words.
All the candidates have strong determination to succeed.

Correct option is D

Option (d) is the correct substitution for the highlighted group of words.
"Fire in their bellies" means a strong determination or motivation.
Example: The young athlete has fire in his belly to win the championship.

Meanings of all the other given options:

· Option A (Flash in the pan): Something that shows great promise at first but fails to deliver anything in the end.

· Option B (Raise the roof): To make a lot of noise, especially by cheering or protesting loudly.

· Option C (Food for thought): Something that makes you think seriously about an issue.