Official Solution:Because of the Sun, which is 400 times as large as the Moon, but also 400 times as far away from the Earth, so both the Sun and the Moon have the same apparent size in the sky. A. Because of the Sun, which is 400 times as large as the Moon, but also 400 times as far away from the Earth, so both the Sun and the Moon have the same apparent size in the sky.
B. The Sun, which is 400 times as large as the Moon, is also 400 times as far away from the Earth, so the Sun and the Moon have the same apparent size in the sky.
C. The Sun and the Moon have the same apparent size in the sky because the Sun, which is 400 times as large as the Moon, and also 400 times as far away from the Earth.
D. Four hundred times larger than the Moon and 400 times farther away from Earth, the Sun has the same apparent size in the sky as the Moon's.
E. Four hundred times larger than the Moon and also 400 times farther away from Earth, so the Sun in the sky has the same apparent size as the Moon.
A. Two independent clauses can be joined by “comma + so”. However the part before “comma + so” is not a complete independent clause - there is no main verb for this clause and hence is only an incomplete phrase “Because of the sun” + a modifier for “sun”. (The part “which is 400 times as large as the Moon, but also 400 times as far away from the Earth” is the modifier of sun).
The parallelism marker “but also” does not have its counterpart “not only”.
B. CORRECT. Two independent clauses are correctly joined by “comma + so”. Following are the clauses:
a. The Sun, which is 400 times as large as the Moon, is also 400 times as far away from the Earth (main verb “is).
b. the Sun and the Moon have the same apparent size in the sky (main verb “have”).
C. The part after “because” is incomplete - there should be a complete clause with a main verb. However in this construction the part after “because” abruptly ends with “Sun” without introducing any main verb (followed by a modifier for “sun”: “which is….”).
D. “Sun” is compared wrongly to “Moon’s (size)”, whereas the comparison should be between the Sun and the Moon.
In other words, the problem with D is the wrong usage of the possessive “Moon's. The correct parallel structure would be:
...the Sun has the same apparent size in the sky as the Moon (has).
The phrases “Four hundred times larger than” and “400 times farther away” have different implications from those of the original phrases “400 times as large” and “400 times as far” respectively.
E. The opening modifier “Four hundred times larger than the Moon and also 400 times farther away from Earth” must be followed immediately by the noun “Sun”. However after this modifier a clause starts thereby keeping the modifier hanging without any noun to refer to.
The phrases “Four hundred times larger than” and “400 times farther away” have different implications from those of the original phrases “400 times as large” and “400 times as far” respectively.
Answer: B