Topic: Group verb,

Best Answer Explained in Below-:

The correct answer to the question is A) "on with," not B) "in with," as the phrase "get on with" is the idiomatic expression that means to have a good relationship or to get along well with someone. The sentence "He is a very difficult person; he does not get on with anyone" implies that he struggles to form positive relationships with others, indicating interpersonal conflict or a lack of social harmony.

In contrast, the phrase "get in with" does not feature in common English usage in the same context. "Get in with" often suggests trying to become part of a group or gaining acceptance, but it does not convey the sense of relationship quality that "get on with" does. The other options, C) "up with" and D) "out with," are also not correct in this context. "Get up with" is not a standard phrase, and "get out with" may imply going out socially, which doesn't fit here.

Thus, the most appropriate phrase is "get on with," as it accurately captures the difficulty the person has in forming relationships.