Getting the listener’s full attention, questioning him or her, and asking him or her to paraphrase the message are all techniques to overcome which communication barrier?

poor listening

Explanation:

Based on the information provided within the question it can be said that this is done in order to overcome poor listening. This refers to individuals who get distracted when listening and hear/understand very little to nothing of what they were supposed to be listening to. By making sure their attention is on you and asking them to repeat what you just said allows the individual to pay more attention to what you are saying and helps the information stick.

they allow producers to sell their products more cheaply than foreign competitors. - ( c.)

answer; commerce clearing house;