[ Grammar ]
Despite being raised in a time and place in which black students were prevented or discouraged from attaining higher education, Percy Julian went on to become a PhD and a successful chemist. His most famous invention were Aero-Foam, a soy protein fire extinguisher used in World War II.
A. NO CHANGE
B. was
C. will be
D. being

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A. can
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a. pi
b. pie
