GMAT Sentence Correction

Q1. George’s personal diary and album formed the basis for his book about the places he had visited.
A. the basis for his book about the places he had visited.
B. the basis for his book regarding the places he had visited.
C. the basis of his book about the places he visited.
D. the basis of his book about the places which he had visited.
Answer : C

Q2. For many years the idea as to if the Xenomorph employed an exoskeleton or endoskeleton plagued debates and discussions with unanswered questions; however, recent ideas based on Dr. Wren's studies suggest that the Xenomorph may employ an endo-exoskeleton: a skeletal structure that exists as both an epidermal structure and as a subdermal structure.
A. the idea as to whether the Xenomorph employed an exoskeleton or endoskeleton plagued debates and discussions with unanswered questions; however, recent ideas based on Dr. Wren's studies suggest that the Xenomorph may employ an endo-exoskeleton: a skeletal structure that exists as both
B. the idea as to whether the Xenomorph employed an exoskeleton or endoskeleton plagued debates and discussions with unanswered questions; however, recent ideas based on Dr. Wren's studies suggests that the Xenomorph may employ an endo-exoskeleton: a skeletal structure that exists both as
C. the idea if the Xenomorph employed an exoskeleton or endoskeleton plagued debates and discussions with unanswered questions; however, recent ideas basing on Dr. Wren's studies suggest that the Xenomorph may employ an endo-exoskeleton: a skeletal structure that exist both as
D. the idea as to whether the Xenomorph employed an exoskeleton or endoskeleton plagued debates and discussions with unanswered questions; however, recent ideas based on Dr. Wren's studies suggest that the Xenomorph may employ an endo-exoskeleton: a skeletal structure that exists both as
Answer : D
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