Moreover, no other social scientist at that time was sufficiently trained in dance to be able to understand dance techniques, while experts in dance were not rained in the methods of social research.
This sentence is really showing why Dunham was innovative (she had both) and why all of this stuff was not given the proper evaluation before.
(A) This is specifically asking about the "experts in dance" and NOT the "social scientist." .
(B) But the "experts in dance" were NOT more qualified. They were equally unqualified (both groups are missing a vital component)
(C) Out of scope. Nothing else to say about this one.
(D) Looks good!
(E) There didn't seem to be a "tension" between these two groups, let alone showing an ADDITIONAL tension (as if one was already mentioned before.
(D) is the best of all of them.