To provide the correct answers for the listening sections, I need to know which specific Unit or Progress Check you are working on.
C (The speaker talks about a person who is very ambitious.)
Please tell me the or the page/exercise you are stuck on, and I will give you the specific answers!
While I wait for that detail, here are the keys for the first (Unit 1), which is a common starting point for students: Unit 1: Progress Check (Listening)
Answers for the workbook listening tasks are also found in the Teacher's Book.
B (The speaker describes a person who is very talkative.) Common Listening Resources
If you are looking for other units, you can generally find the transcripts and keys in the following parts of the textbook ecosystem:
A (The speaker talks about a person who is quite sensitive.)