The correct option is B get along
A phrasal verb is a verb combined with an adverb or preposition to
provide a meaning different from the literal meaning of that individual
verb. The underlined phrase is a phrasal verb of the form verb (get) + adverb (together). It means 'to gather' people for a task or just an informal meeting. It's not quite relevant to the sentence due to the adverb 'well' that follows, hence it needs to be changed for a more suitable phrase, like 'get along'. 'Get along' is a phrasal verb that means 'to like each other', to gel together, it is relevant in meaning to the sentence. Hence option A is wrong and C is right. 'Get around' means 'to coax someone or persuade', 'to deal with a problem', it isn't relevant here as the sentence focuses on the compatibility of two people, hence option B is incorrect. 'Get away' means 'to escape', 'he got away with the crime', it does not provide the required meaning to the sentence, hence option D is incorrect.