Answer:
c is the answer
Step-by-step explanation:
well we know that a subject-verb agreement is a subject and its verb must be both singular or both plural.
So lets do a check list:
A. Runnings around my neighborhood is my favorite way to exercise.
( Does not make sense instead of runnings put running )
B. Running around my neighborhood were my favorite way to exercise.
( Verb means doing like “ driving “ not “ were )
Running around my neighborhood are myfavorite way to exercise.
( It is correct it does not have improper words like in Option A & B. )
C being the answer