Which sentence uses correct subject verb agreement?

A. My brother always wants to cook dinner.
B. My teachers often gives homework on the weekend.
C. The cat carefully steps across the fence.
D. The clouds swiftly moves across the sky.

C. The cat carefully steps across the fence.

The correct sentence that uses subject-verb agreement is:

C. The cat carefully steps across the fence.

In this sentence, "The cat" is the subject, which is singular, and "carefully steps" is the corresponding verb, also singular.

The sentence that uses correct subject-verb agreement is:

C. The cat carefully steps across the fence.

To determine the subject-verb agreement in a sentence, you need to match the singular subject with a singular verb and the plural subject with a plural verb.

In option A, "My brother" (singular) is correctly matched with "wants" (singular).

In option B, "My teachers" (plural) is incorrectly matched with "gives" (singular). The correct verb should be "give" (plural).

In option C, "The cat" (singular) is correctly matched with "steps" (singular).

In option D, "The clouds" (plural) is incorrectly matched with "moves" (singular). The correct verb should be "move" (plural).

Therefore, option C is the correct sentence with subject-verb agreement.