The fine, powdery substance that covers the Moon’s surface is called regolith. Because regolith is both readily available and high in oxygen ______blank scientists have wondered whether it could be used as a potential source of oxygen for future lunar settlements.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: B
Explanation
Choice B is the best answer. The convention being tested is punctuation between a subordinate clause and a main clause. This choice correctly uses a comma to mark the boundary between the subordinate clause (“Because...content”) and the main clause (“scientists...settlements”).
Choice A is incorrect. Joining the subordinate clause (“Because...content”) and the clause that follows (“scientists...settlements”) with the conjunction “and” results in an ungrammatical sentence that lacks a main clause. Choice C is incorrect because it fails to mark the boundary between the subordinate clause and the main clause with appropriate punctuation. Choice D is incorrect. Joining the subordinate clause (“Because...content”) and the clause that follows (“scientists...settlements”) with a comma and the conjunction “and” results in an ungrammatical sentence that lacks a main clause.
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