Your answer would be B
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"The density of a substance determines how much light is refracted"
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Dr. Brantz wants to test the part of the brain which is active while lying. For this purpose, he will need to make use of the fMRI (functional magnetic resonance imaging) technique. This technique is used for measuring the brain activity by the means of the detecting changes in the blood flow. The neural activation affects the cerebral blood flow, and this change can be noticed using fMRI.
Hence, the answer is 'fMRI'.
A salt or ester of phosphoric acid, containing PO43− or a related anion or a group such as —OPO(OH)2.