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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 split- ting them apart, as nuclear reactors do (D) and merges the nuclei of atoms but does not split them apart, as is done in unclear reactors (E) and merges the nuclei of atoms, unlike atomic reactors that split them apart.
D and E are out because ", and merges" is not correct. A and D create illogically parallel structure between in nuclear reactors and in what ?? B as is required here