【求助 】大全670 逻辑修饰问题

小羽羽

670.Stars like the sun can continue to shine steadily for billions of years because its light and heat are produced by nuclear fusion, in which titanic releases of energy result in the loss of only tiny amounts of mass.
(A) its light and heat are produced by nuclear fusion, in which
(B) nuclear fusion produces its light and heat, in which
(C) nuclear fusion produces their light and heat, where
(D) its light and heat are produced by nuclear fusion, where
(E) their light and heat are produced by nuclear fusion, in which

误选了C，当时觉得主动优于被动
A.B.C可以根据its迅速排查，但后面的定从不知道修饰什么，是什么意思，in which和where有什么区别么？

小羽羽

670         Stars like the sun can continue to shine steadily for billions of years because its light and heat are produced by nuclear fusion, in which titanic releases of energy result in the loss of only tiny amounts of mass.

(A) its light and heat are produced by nuclear fusion, in which

(B) nuclear fusion produces its light and heat, in which

(C) nuclear fusion produces their light and heat, where

(D) its light and heat are produced by nuclear fusion, where
(E) their light and heat are produced by nuclear fusion, in which