Q1: I like ice cream; it is delicious.
Q2: I hope you like watching baseball, I really love it.
Q3: Fails to express a complete thought.
A semicolon is used to join two independent clauses that are linked, share the same ideas, or at least closely related in thought. Among the choices given, only the last choice has 2 independent clauses.
In the sentence, "I hope you like watching baseball, I really love it." Using a period where the comma is or a semi-colon would have been better. These two independent clauses were connected improperly, which makes it a run-on sentence.
A sentence fragment is a group of words that fail to complete a sentence because it does not have a complete thought. It is mainly just a "fragment" of a sentence and so it cannot stand on its own.