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The author's primary purpose is to
The passage discusses two theories of the Moon's formation. Although a scientific theory is not undisputed fact, by discussing theories the author emphasizes what scientists do know, not the knowledge that they lack.
Although the author discusses two competing theories of the Moon's creation, he or she does not just compare the two but shows why one is better than the other.
The theory proposed by reputable scientists is criticized by the author, who calls it inherently flawed. Therefore the author does not applaud, or praise, these scientists.
Although the author criticizes the first theory of the Moon's creation, she or he supports the second one. Therefore, to the author, not all theories of the Moon's creation are flawed.
Lunar formation means "how the moon was formed". The passage deals with two possible theories of how the moon as created:
1) first sentence: created simultaneously with Earth from the primordial accretion disc. The passage then goes on to explain the problems with this theory, leading up to:
2) 7th sentence:Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars.
thus the answer is correct.