TOEFL Reading: ETS-TOEFL阅读机经 - LAA75F3B33EHFF1GL$

Why does the author note that "Some people adapt more quickly to new surroundings than others do"? A. To argue that some people experience little psychic cost when they change jobs B. To support the claim that the psychic cost of changing jobs is likely to differ widely between individuals C. To illustrate why some psychic costs are unobservable to researchers D. To argue that psychic costs alone cannot fully explain changes in mobility rates