Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
1. All melons are lemons.
2. No lemon is a pea.
Conclusions:
I. No lemon is a melon.
II. No melon is a pea.

​Statements:
1. All melons are lemons.
2. No lemon is a pea.

​Conclusions:
I. No lemon is a melon. (False, all melons are lemons).
II. No melon is a pea. (True, there is no relation between melon and pea).

So, ​Only II follows.

Thus, correct option is (b).