A) By skimming along the top of the atmosphere, a proposed new style of aircraft could fly between most points on Earth in under two hours, according to its proponents.
I dont get how this option is correct, why are we saying that a style could fly between most points on Earth? Also, if the its in "according to its proponents" is referring to the aircraft (when ideally it should refer to new style, but I get that the meaning becomes illogical then), then why are we saying that the "it" in option C is referring to Earth?
B) By skimming along the top of the atmosphere, proponents of a proposed new style of aircraft say it could fly between most points on Earth in under two hours.
I see why this is incorrect, we are implying proponents are skimming along the top of atmosphere
C) A proposed new style of aircraft could fly between most points on Earth in under two hours, according to its proponents, with it skimming along the top of the atmosphere.
The same error - a proposed style is flying between points. But the it in "with it skimming along" cannot logically refer to Earth, and should refer to aircraft
D) A proposed new style of aircraft, say its proponents, could fly between most points on Earth in under two hours because of its skimming along the top of the atmosphere.
its is possessive, indicating that skimming atop the atmosphere is something that it possesses, incorrect
E) According to its proponents, skimming along the top of the atmosphere makes it possible that a proposed new style of aircraft could fly between most points on Earth in under two hours.
Wordy and unidiomatic. makes it possible that a - is unidiomatic
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