Explanation
Correct answer: D.
Choice D is the best answer. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so making them into two separate sentences is grammatically correct.
Why the other choices are wrong
Choice A
Choice A is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with at least a comma + a coordinating conjunction. This choice provides the coordinating conjunction “but,” but it’s missing a comma.
Choice B
Choice B is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with a semicolon, a colon, a dash, a period, or a comma + a coordinating conjunction.
Choice C
Choice C is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with at least a comma + a coordinating conjunction. This choice provides a comma, but it’s missing a coordinating conjunction.