OFFICIAL EXPLANATION
Step 1: Identify the Question TypeThe question stem instructs us to seek an assumption on which the argument depends.
Step 2: Untangle the StimulusFirst identify the conclusion: The number of health care workers is about to rise, as is the average
compensation of those workers. Next, find the evidence: The median age of the world and, by extension,
the number of elderly people are increasing.
Step 3: Predict the AnswerTo find the central assumption, link the terms of the evidence with the terms of the conclusion. The
conclusion centers on more workers who’ll get more money. The evidence centers on more elderly.
The assumption, which links the evidence and the conclusion, must center on the idea that the
elderly are especially likely to require the services of health care workers.
Step 4: Evaluate the Choices(C) is the best match for our prediction and, thus, the correct answer. (A) gets the cause-and-effect
relationship from the argument in the wrong order, since the author argues that the increase in
life span will be responsible for an increase in the number of health care workers. (B) draws an
irrelevant comparison. The author argues that the average compensation received by all health care
workers will increase. (D) certainly doesn’t have to be true—the conclusion can still follow from the
evidence even if there are elements of American health care that are more expensive than geriatrics.
(E) is similarly extreme. It need not be true that the median age of the population will increase in
every corner of the globe. Choice (C) is the correct answer.