Select the option that can be used as a one-word substitute for the given group of words.
The act of washing oneself

Correct option is A

The phrase "the act of washing oneself" refers to the process of cleaning one's body. The best one-word substitute for this phrase among the options is (a) Ablutions, which means the act of washing oneself, usually as a religious or ritual practice.
Meanings of other three options are as follows:
solutions- a means of solving a problem or dealing with a difficult situation.
Steaming- very angry.
Bathing- wash yourself(someone) while immersing them in a bath.