I think the correct choice is D such that the sentence becomes: <span>Jan's speech was interesting and lively; Tim's was a bit too long. This is because semicolons are typically used to link two independent clauses that are very much related. In this case the two independent clauses are:
(1) Jan's speech was interesting and lively
(2) Tim's was a bit too long</span>
Im not sure if its nouns...
