541 Nuclear fusion is the force that powers the Sun, the stars, and hydrogen bombs, merging the nuclei of atoms and not splitting them apart, as in nuclear reactors.
(A) merging the nuclei of atoms and not splitting them apart, as in nuclear reactors
(B) merging the nuclei of atoms instead of splitting them apart, like nuclear reactors
(C) merging the nuclei of atoms rather than splitting them apart, as nuclear reactors do
(D) and merges the nuclei of atoms but does not split them apart, as is done in nclear reactors
(E) and merges the nuclei of atoms, unlike atomic reactors that split them apart


Can someone please explain why the answer is E and not C? The last part of e seems like a sentence fragment. Are there any general rules about when prepositional phrases at the end of the sentence are legal. They keep looking like fragments to me (esp. phrases starting ",with")

Thanks.

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"rather than" compares verb or actions so C wrong.
E is correct. there is no fragment structure
its P is x that...... and merges (both present tense. proper use of unlike, though comparision btw nuclear fusion (process) and nuclear reactor ( a device) is flawed. but E IS BEST AMONG ALL and we have to choose the best.