A.
Physics is a difficult subject to learn
B.
News travel fast
C.
The study of various sciences are compelling
D.
Measles usually spread through respiratory fluid
Answer Explanation
A. Physics is a difficult subject to learn.
In this sentence, "Physics" (singular) is paired with the singular verb "is." This is a correct subject-verb agreement.
The other options have issues with subject-verb agreement:
B. "News travel fast" should be "News travels fast."
C. "The study of various sciences are compelling" should be "The study of various sciences is compelling."
D. "Measles usually spread through respiratory fluid" should be "Measles usually spreads through respiratory fluid."
