A is the correct answer. Allegory uses a lot of metaphors, and symbols, usually to refer to something else, to a greater cause or truth. The other options are just not acceptable.
<span>The best phrases that describe best of the writing style of Henry David Thoreau is that how the content of his writings are so truthful and idealistic. The significance of content greatly outweighed that of style. He prevented excessive emphasis on form at the cost required of the content. He desired each word to be valuable, to bear meaning, and he had no attention in the purely something to look more attractive as all things are real.</span>
