Choose the set of words that is an adjective clause:

i hardly recognized my car, which had undergone a complete make-over.

a) i hardly recognized
b) recognized my car which had
c) my car which had undergone a complete
d) which had undergone a complete make-over

The answer is "which had undergone a complete make -over". 
a dependent clause that modifies a noun

Ifound this on google “use commas to separate two or more coordinate adjectives that describe the same noun. be sure never to add an extra comma between the final adjective and the noun itself or to use commas with non-coordinate adjectives.” i hope this you for what your looking for