两道gwd 不同版本给的答案不一致~

GWD-10-Q2: GWD-11-10

Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is precisely the opposite, a tool for communicating with a large, public audience.

A.      Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is

B.      Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, but which is

C.      Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become

D.      Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become

E.       Marconi conceived of the radio to be a substitute for the telephone, a tool for private conversation, other than what it is,

一版给的是c 一版给的是E

A.      On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow

B.      On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth

C.      On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles

D.      Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate

E.       Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow

这两道题应该是什么答案啊？