Following are the statements about prostomium of earthworm. (a) It serves as a covering for mouth. (b) It helps to open cracks in the soil into which it can crawl. (c) It is one of the sensory structures. (d) It is the first body segment. Choose the correct answer from the options given below.

1. A. (a), (b) and (d) are correct
2. B. (a), (b), (c) and (d) are correct
3. C. (b) and (c) are correct
4. D. (a), (b) and (c) are correct

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