1) Parallelism - the sentence states that "Researchers are using computer images…..(to do 2 things)." The first is "to help surgeons…." so the second should also be " and to…..'something'. Eliminate B, D and E.
2) Comparisons - the first part of the comparison states how computer images are used to HELP surgeons. The second part of the sentence offers a comparison to how flight simulators similarly HELP pilots. The sentence needs a verb to properly complete the comparison.
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2) Comparisons - the first part of the comparison states how computer images are used to HELP surgeons. The second part of the sentence offers a comparison to how flight simulators similarly HELP pilots. The sentence needs a verb to properly complete the comparison.
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