The correct option is A lazy
Dilligent means having or showing care and conscientiousness in one's work or duties. The opposite of diligent is lazy, or unwilling to work or use energy. Hence, Option B is correct. Among the rest of the options, sedulous means (of a person or action) showing dedication and diligence, sedentary means characterized by much sitting and little physical exercise, attentive means paying close attention to something. These options do not express this antonym, hence incorrect