Read the following text and answer the question.

Exactly how bad is the job situation going to be? An Organization for Economic Cooperation and Development study concluded that 9% of American jobs are at risk. Two Oxford scholars estimate that as many as 47% of American jobs are at risk. Even the optimistic scenario portends a serious problem. Whatever the case, it will need to be possible, within a few decades, for a life well lived in the U.S. not to involve a job as traditionally defined. A UBI will be an essential part of the transition to that unprecedented world.

–“A Guaranteed Income for Every American,”
Charles Murray

Question: The writer acknowledges potential limitations of sources cited in this passage by

A. implying the agenda of each source.
B. juxtaposing public and private estimates.
C. noting that neither conclusion is proven.
D. using the conservative prediction to support his claim.
E. highlighting the vast difference in predictions.