The correct answer is (D).
Getting to the Answer:As written, the sentence is a fragment since it does not include an independent clause. Notice that the second phrase is not underlined, so it cannot be changed. The correct answer choice will make the first clause independent.
(A) Incorrect: the original sentence is a fragment without an independent clause
(B) Incorrect: this choice retains the error of the original; the sentence has no independent clause
(C) Incorrect: this choice retains the error of the original; the sentence has no independent clause
(D) Correct: this choice creates an independent clause conveying a complete idea ("The polished surface ... is so slick ...")
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