If you start out working along side someone, that someone is giving you an education in how to do the job you want to do. If you are planning a profession such as a doctor or lawyer, prepare yourself for a LOT of education. You need at least a basic education in order to prepare you for ANY profession.
Explanation:
Change it up a little bit and your teacher will never know :)
'That' is A, a demonstrative pronoun. Because you are referring to that person, you are basically pointing at your cousin, therefore it must be a demonstrative pronoun.
