Official Solution:
The remote ice planet is controlled not by the Empire, but by the rebel alliance.
A. The remote ice planet is controlled not by the Empire, but by the rebel alliance.
B. The remote ice planet is not controlled by the Empire, but instead by the rebel alliance.
C. The remote ice planet is not controlled by the Empire, but the rebel alliance controls it.
D. The remote ice planet is controlled not by the Empire, rather by the rebel alliance.
E. The remote ice planet is controlled not by the Empire, but it is controlled by the rebel alliance.
A. CORRECT. In the construction “NOT X, BUT Y”, parallelism is maintained. X = “by the Empire”, Y = “by the rebel alliance”. Both are prepositional phrases.
B. In the construction “NOT X, BUT Y”, parallelism is not maintained. X = “controlled…”, Y = “by the rebel alliance”. One is a verb, whereas the other is a prepositional phrase.
Moreover the use of “instead” after “but” is unnecessary.
C. In the construction “NOT X, BUT Y”, parallelism is not maintained. X = “controlled…”, Y = “ the rebel alliance controls..”. One is a verb, whereas the other is a clause.
D. The usage of only “rather” without “but” is wrong. In certain cases the word “rather” may be used without “but” to show contrast, but in such an application, it must be followed by a complete sentence and hence there should be a semicolon before the word “rather”. For example:
“The remote ice planet is controlled not by the Empire; rather it is controlled by the rebel alliance.”
E. In the construction “NOT X, BUT Y”, parallelism is not maintained. X = “by the Empire”, Y = “it is controlled…..”. One is a prepositional phrase, whereas the other is a clause.
Answer: A