Read the excerpt from H. G. Wells's The War of the Worlds. A big greyish rounded bulk, the size, perhaps, of a bear, was rising slowly and painfully out of the cylinder. As it bulged up and caught the light, it glistened like wet leather. Two large dark-coloured eyes were regarding me steadfastly. The mass that framed them, the head of the thing, was rounded, and had, one might say, a face. There was a mouth under the eyes, the lipless brim of which quivered and panted, and dropped saliva. Which statement best describes how Wells conveys his purpose with this excerpt?

a. He creates powerful visual images.
b. He appeals to the reader's intellect.
c. He shares an expert opinion.
d He defines key terms.