It is clear to me that the person who wrote this test question believes the correct answer is C. But that is subject to some debate. I think there is no correct answer among the given choices. The 2017 NEC has a clarification on this. The disposal under the sink is further than 6 feet from the sink, under the revised rule.
There was a recent discussion on this forum as to whether a receptacle under the sink could have GFCI, given the question of whether it would be readily accessible. I don't recall whether we reached a consensus. My view is that it is readily accessible.
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