Clitellum in earthworm are present in which of the following segments?A. 19, 20, 21B. 14, 15, 16C. Last 3 segmentsD. First three

The clitellum in earthworms is present in segments 14, 15, and 16. So, the correct answer is:

B. 14, 15, 16

Explanation:
The clitellum is a thickened, glandular, and non-segmented part of the body wall in earthworms and other members of the class Clitellata. It plays a vital role in reproduction, as it secretes a mucous cocoon in which the earthworm's eggs and sperm are deposited. In earthworms, the clitellum typically covers segments 14, 15, and 16, which can be seen as a distinct swollen band near the anterior end of the worm.

The clitellum becomes more prominent during the reproductive season, indicating sexual maturity in the worm.