Koko asks her new boyfriend if he would like to come with her to her sister's wedding. the boyfriend likes koko a lot, but he does not think he is ready to meet her family, so he tells her he has an important previous commitment. this is an example of a lie that

avoids any dispute/conflict

Explanation:

According to the situation described in the question, Koko's boyfriend likes her a lot but he has some unsure feeling regarding meeting her parents because he is not mentally prepared for it.

Therefore, when Koko asks him to come along to her sister's wedding with her, he lied to her  by stating that he already has some committed works to complete as a reason.In this way he trying to keep away any kind of conflict between him and Koko so that his relationship does not has to face any kind of issue.

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.