It is whom. You can only use who if you can replace is with he or she.
Answer:
Implied definition
Explanation:
It means the context is giving you different clues or hints in order to understand the meaning, but it is not actually stated.
For instance, let's say you are talking to your friend, but he is not really looking at you in the eye, he is constantly yawning and he is also checking his watch. What is the implied meaning here? He is bored. However, he does not say anything, you just imply it out of his behavior.
The answer is a. Wary means to be cautious and hesitant means to stop and be cautious