Concept:The phrase needed here is the phrasal verb “give in,” which means to yield or surrender.
Explanation:The sentence advises against yielding to temptation.
“Give in” is the correct phrasal verb for this meaning.
It is usually followed by “to” when the thing being yielded to is mentioned.
So we say “give in to the temptation.”
Using “on,” “for,” or “with” would not create this meaning.
Therefore, the missing word is “in.”
Answer:A. in