Which sentence displays correct subject verb agreement

Question

The herd is in the north pasture
The herd remain in the barn
The herd have calves in the spring
The herd are milked each morning

Answer 1

The sentence that displays correct subject-verb agreement is: "The herd is in the north pasture."

In this sentence, "herd" is a collective noun and is treated as a singular entity, so it takes the singular verb "is."