Great question you two -
(D) is very tempting here.
On an
overlap question, it's critical to be very specific about the support for the answer in each passage.
The primary temptation of
(D) stems from the fact that Passage A sets up the issue as a paradox. It's easy to allow this perspective to frame the issue for both passages - and that's exactly what the LSAT writers expect you to do. But Passage B never treats the situation as a paradox at all. That author dives immediately into a discussion of why relative wealth is important to us - but proposing an explanation for a phenomenon is not always the same as resolving a paradox.
However, both authors rely on data, supporting
(E):
Passage A does not use the word data, but paragraph 2 refers indirectly to what seems to be data actually collected.
"if we ask people....the 'required income' correlates"
"we can also look at reported happiness over time"
"job satisfaction....rises if wages rapidly increase"
Additionally, the study mentioned explicitly in line 25 and its results in line 32 are surely data!
Passage B's support is a bit easier to find: line 50
"the data show that..."
The Other Wrong Answers
(A) Only Passage B makes reference to biological origins (and only then as a counterpoint the author disagrees with).
(B) Neither author uses wide belief as support for a conclusion.
(C) Neither author proposes accepting a claim for the sake of argument.
On overlap questions, be vigilant not to allow any framing of the issues from Passage A to bleed over into your assessment of Passage B!
I hope this helps clear things up a bit!