4. which sentence combines the two sentences using an adjective clause that
functions as part of the subject?
a the chinese began using flags more than 3,000 years ago, and they
made flags from silk.
b the chinese used flags, made with silk over 3,000 years ago.
c the chinese, who made flags from silk, began using them more than
3,000 years ago.
d making flags from silk, the chinese began using flags more than 3,000
years ago.

C. The Chinese, who made flags from silk, began using them more than 3,000 years ago.    

Explanation:

The adjective clause who made flags from silk  functions as part of the subject because it modifies the word Chinese, which is the simple subject of the sentence.  The complete subject of this sentence would be The Chinese, who made flags from silk.    

the answer is c.going into the business right after high school

explanation: