Answer:
who
Explanation:
"who" is used to a subject of the sentence
"whom" is used to an object of the sentence
e.g. I always make my friend, whom isfrom New York, laugh.
"whose" is used to an possession of a subject/ object
e.g. My friend, whose apartment is in New York, makes me laugh.
Answer: Who
Explanation
compound complex sentence
A. To support a speaker’s point by providing evidence of clarity.