The sentence that correctly uses a semicolon is "The curtains were shredded and all over the room; my cat looked very guilty." Optio B is correct.
The semicolon is a punctuation mark that devides significant sentence elements. A semicolon can be placed between two closely related independent clauses, provided they are not already joined by a coordinating conjunction. Furthermore, semicolons can be employed in place of commas to separate items in a list, particularly when the elements of that list contain commas.
