<span>In order to vary the sentence structure, the sentence I would insert in the blank is C. Have you noticed how hard she works? The reason for this is because inserting an interrogative sentence that has a completely different structure and word order than the other two sentences works great in order to introduce some versatility into a paragraph consisting of a couple of sentences. Here, the only sentence that differs is C. which is why you should choose it. Starting three sentences in a row with the same word can be a bit dull and repetitive. </span>
"There's a fascinating psychological reason behind your belief in ghosts<span>. Halloween is a time to celebrate </span>ghosts<span>, vampires, and everything supernatural. ... More than a third of </span>people<span> surveyed also said they </span>believed in ghosts<span> or spirits returning from the dead."</span>
