Both of the campus supervisors_the hall

A. Walk

B. Walks

The correct answer is A: WALK

Explanation:

Both of the campus supervisors walk the hall.

In this case, the correct answer is walk, because both of the campus supervisors represent a third person of plural, which is they, so it requires the plural form of the verb.

The verb TO WALK in Present Simple tense conjugates as follows:

1. (I) WALK

2. (You) WALK

3. (He/She/It) WALKS

1. (We) WALK

2. (You) WALK

3. (They) WALK