Which of the following is a subordinate clause?

a.) the statue was erected to guard the harbor.
b.)which was erected to guard the harbor.
c.)this was the statue.
d.)it stood one hundred feet tall.

Ivansanger rainsfordgeneral zaroffwhitneyadventurous hunter; calm and composed; considers himself a realist; new yorker; veteran of world war ia hunter; sympathetic to the plight of voiceless, defenseless animals; cautiouscossack; mute; formidable physical stature; wears a black uniform; used to whip prisoners for the great white czarcossack; aristocrat; has sharp, pointed teeth and red lips; devoid of humanity and emotion