Final answer:
The correct answer is B) Howard Carter pioneered Egyptology. He discovered King Tut's tomb, which uses a full stop to properly separate two independent clauses.
Step-by-step explanation:
The sentence that uses appropriate punctuation is B) Howard Carter pioneered Egyptology. He discovered King Tut’s tomb. This sentence correctly uses a full stop to separate two independent clauses. Option A is a run-on sentence, C incorrectly uses a comma to separate independent clauses which can create a comma splice, and D uses a colon incorrectly as the second clause does not exemplify or expand on the first.