In "there will come soft rains," why does the author turn the house into a mechanical creature? a. to stress how well run the future will be b. to keep readers from realizing at the start that no humans are present c. to stress how scientific advances can create the perfect society d. to compare the present with the earlier, non-mechanical times

I already answered the question but here it is again:

The correct answer is B. to keep readers from realizing at the start that no humans are present.

Indeed, Bradbury’s story is intended to warn readers that the inevitable consequence of an all-out nuclear war is the extinction of the human race. His story is inspired by the much earlier poem from American poetess Sarah Teasdale, who wrote the poem of the same title in the aftermath of World War I, which until then had been the most devastating conflict in the history of the world at that time. Since the house is a mechanical entity; it stresses the fact that it was built by humans but since no humans are present anymore, their absence is all the more noticed and the, dramatic impact for readers is stronger and everlasting.

c is a symbol. when bernice gets her hair cut, it is the authors way of showing the affects and demands of pier pressure and the over-all attitudes of people at the time.