Final answer:
The sentence that displays correct subject-verb agreement is: The herd is in the north pasture.
Step-by-step explanation:
The sentence that displays correct subject-verb agreement is: The herd is in the north pasture. When the subject 'the herd' is singular, the verb must also be singular.
In this case, 'is' is the singular verb that agrees with the singular subject 'the herd'.