<em><u>Answer:</u></em>
b) The comma attempts to join two independent clauses.
<em><u>Explanation:</u></em>
When two ideas come together and either one of them can stand by itself as its own, independent sentence, then the use of the comma is correct:
Comma + a conjunction (and, but, for, nor, yet, or, so)
"Michelle is terrified of spiders<u>. W</u>hen she found one in the bathroom, she panicked, refusing to shower for three days."
