Whitch of the following is a subordinate clause

Question:

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.

Which was erected to guard the harbor is a subordinate clause

Explanation:

Main Clause: a clause that can form a complete sentence standing alone, having a subject and a predicate

Subordinate clause: a clause, typically introduced by a conjunction, that forms part of and is dependent on a main clause

Example: Peter came to the party and the celebration started.

Peter came to the party  - Main Clause

the celebration started - Subordinate clause

and - conjunction also known as a subordinator such as when, because, although, if, etc.

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself. 

hope this answer you! have a great day.