C (The speaker talks about a person who is very ambitious.)
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) otvety k audirovaniiu 10 klass biboletova
This contains the full scripts for every audio track and the answer keys for all exercises. C (The speaker talks about a person who is very ambitious