What is a crescendo in public speaking

Fred: (waves to sarah) hi, i just moved here. my name is fred. sarah: hi fred. where are you from? fred: florida. the weather here in michigan sure is cold. sarah: i know what you mean, i moved here from san diego two years ago. wait until january. fred: i can just imagine. hey do you mind if i sit with you for a little while? sarah: no, take a seat. i’d love the company during lunch. fred: it’s been hard to meet anyone since i started school last week. sarah: no worries. i know exactly how you feel. i moved at the end of the school year and didn’t get to know anyone. then i spent the summer alone. fred: aw, bummer. it sure is tough to start a new school. sarah: yeah, but when school started again, i met some cool people. fred: i am really shy about meeting new people. sarah: well, i can introduce my friends to you. (bell rings) fred: that would be great! guess lunch is over. it’s been great talking to you. sarah: you too. meet me here for lunch tomorrow and i’ll introduce my friends. fred: great. bye. sarah: later. the conversation between fred and sarah is an example of impersonal communication. select the best answer from the choices provided t f

What is the main problem with the following critique? “you put some thought into it, but you obviously do not care much about the topic you are presenting.” a. it is not ethical. b. it is not constructive c. it is not specific. d. it is not behavior focused.

Ihave no idea what the explanation is.