Read the sentence.
An American businessperson discovered a stockpile of King Tut's items that had been hidden in a safe tomb, which had a clay sealing covering it.
Which best identifies the independent clause?
A) that had been hidden in a safe tomb
B) which had a clay sealing covering it
C) that had been hidden in a safe tomb, which had a clay sealing
D) An American businessperson discovered a stockpile of King Tut's items