Two main components of active listening are effort and focus.
A coordinating conjunction is used to link phrases, words, clauses, or sentences of equal rank. The coordinating conjunctions are for, and, nor, but, or, yet, and so. In the paragraph you have given above, sentence 4 and sentence 6 have used the coordinating conjunction "and". In your choices, Sentence 4 appears; thus, it's the best answer.
A. Sentence 4
