Correct! The answer here is c.
What's going on here is that "Unlike liquids" in the beginning forces you to put the words "solid objects" next. Why? Well, "Unlike liquids" describes nothing but "solid objects" which is the subject of the sentence. Introductory verbal phrases, which is what "Unlike liquids" is in this case, must modify the subject of the sentence. Therefore, the choice is down to two: c or d. The original sentence uses "cannot." As a result, the choice with the word "can" keeps to a closer meaning of the original.