​In the following question, a statement is given followed by two conclusions I and II. You have to consider the statement and both the conclusions and then decide which of the conclusion/s is/are implicit :

Statement: Detergents should be to clean cloths.
Conclusions:
l. Detergents form more lather.
II. Detergents help to remove grease and dirt.

Statement: Detergents should be to clean cloths.

While some detergents do produce more lather, the statement does not explicitly mention lather as a reason for cleaning effectiveness. Statement I does not follow.

Since the purpose of detergents is cleaning, and removing grease and dirt is a fundamental aspect of cleaning. Statement II follows.​

Thus, the correct option is (a) only conclusion II follows.