Based on context clues in the sentence below, prolific would most likely means:

Thomas Edison was a prolific inventor, holding over 1,000 patents for his inventions.
a. brilliant
b. famous
c. prolonged
d. abundant

d. abundant

Based on the context clues in the sentence, prolific most likely means d. abundant.

Based on the context clues in the sentence, the word "prolific" can be inferred to mean "abundant" (option d).

To arrive at this answer, you can look at the context of the sentence. The sentence mentions that Thomas Edison was a prolific inventor and held over 1,000 patents for his inventions. This implies that he had a large number of inventions or created a significant amount of work, which aligns with the meaning of "abundant."

Alternatively, you can use other context clues such as "holding over 1,000 patents" to deduce that "prolific" means "abundant." The fact that Edison had such a high number of patents suggests that he must have had a considerable output of inventions.