The game of Chess, in which two players utilize strategy to capture the opponent's king _______ requires intense concentration.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
undoubtedly
B
, undoubtedly
C
undoubtedly,
D
, undoubtedly,
Correct Answer: B
Choice B is the best answer. The sentence contains a nonrestrictive relative clause "in which two players utilize strategy to capture the opponent's king." This clause started with a comma (after "Chess") and must end with a comma before the main verb "requires" (modified by "undoubtedly").
Choice A is incorrect because it lacks the closing punctuation for the relative clause.