Choose the correct sentence.

A. The cat is sleep on the mat.
B. The cat is sleeping on the mat.
C. The cat are sleeping on the mat.
D. The cat are sleeps on the mat.

Explanation:
The correct sentence is option B, “The cat is sleeping on the mat.” It uses the correct verb form “is sleeping” for the singular subject “the cat.” Option A uses the incorrect verb form “is sleep,” option C uses the incorrect subject-verb agreement “cat are sleeping,” and option D uses the incorrect subject-verb agreement “cat are sleeps.”