Select the answer that contains the correct punctuation for the following sentence.

A diamond is the hardest natural substance it can scratch any other stone.

A. The sentence is correct.
B. ... substance, it can...
C. ... substance; it can...
D. ... substance; and, it can...

I'm stuck between B and C.

3 answers

C is correct. You have two independent clauses in this sentence, so need a period or a semi-colon to separate them.
okay thanks!
You're welcome.