Question

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 ______ aero - foam, a soy protein fire extinguisher used in world war ii. which choice completes the text so that it conforms to the conventions of standard english? choose 1 answer: a were b was c will be d being

Explanation:

The subject "His most famous invention" is singular. We need a singular verb in the past tense (since the context is about Percy Julian's past invention). "Were" is plural, "will be" is future, and "being" is a non - finite verb form that can't function as a main verb here. "Was" is the correct singular past - tense verb.

Answer:

B. Was