What part of speech is this sentence?

my best friend alex plays tennis every afternoon

My friend, Alex, plays tennis.

My = possessive pronoun

friend = subject

Alex = an appositive (which is a noun that renames another noun right beside it) -- though not an adjective, it functions like one to explain which friend

plays = verb

tennis = direct object

hope this helps :)

d. to inform the recipient of the advantages of a business proposal

appeal to ethos is your answer.