This is a bit of a nuanced question and answer choice. Let's look at it.
For these questions, Must Be True (and the most supported variant), predicting correct answer choices is often futile because the correct answer could be the combination of any number of ideas, or simply a paraphrase of a statement within the passage.
In this case, answer choice E states the following:
"Many people in the US regard the social responsibility of big business as extending beyond providing consumers with fairly priced goods and services"
This is the result of combining two ideas within the passage. If most people view big business as providing consumers with fairly priced goods and services, but most people perceive big business as socially responsible only in times of prosperity, then there must be some other factor included in social responsibility that most people find big business doesn't satisfy in times other than prosperity. Otherwise, if providing consumers with fairly priced goods and services was all that was considered for social responsibility in the eyes of most people, than most people would think that big business is socially responsible at all times.
I hope this helps. Please let me know if you have any other questions.