My approach-
I thought preposition "at" is required before "specific spots" so as to be parallel with "over a wide area". So, only B and C remains.
"as opposed to at" is awkward. So, chose B as answer.
I thought preposition "at" is required before "specific spots" so as to be parallel with "over a wide area". So, only B and C remains.
"as opposed to at" is awkward. So, chose B as answer.
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