A) No stocks of the abandoned pigment existed after 1509. --> doesn't matter because prompt stated he abandoned using older pigment once cheaper version was introduced. Thus, eliminate.
B) Michelangelo did not work on the painting over the course of several years. --> Correct, by POE. Also, can be supported if you're still not convinced by the negation test (i.e. he completed work in course of several years).
C) The coin depicted in the painting was known to general public in 1507. -->
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B) Michelangelo did not work on the painting over the course of several years. --> Correct, by POE. Also, can be supported if you're still not convinced by the negation test (i.e. he completed work in course of several years).
C) The coin depicted in the painting was known to general public in 1507. -->
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