Backchanneling cues are best defined as

a) responses to indicate the listener’s degree of involvement while the speaker is talking
b) nonverbal behaviors indicating that the speaker needs to repeat or explain something he or she said earlier
c) unvaried responses that indicate boredom
d) metaphorical steps backing through a descriptive process

option A

Explanation:

The correct answer is option A

Backchanneling cues are the responses made by the listener which indicates that degree of the involvement while the speaker is talking.

Messages with which the speaker knows you're paying attention, the attention of the listener can be judged by the speaker by seeing the nod in agreement or say, "I see" or "Uh-huh".    

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answer; if congress didn't act on certain requests;