Which choice completes the text so that it conforms to the conventions of Standard English?
A
explore
B
has explored
C
explores
D
exploring
Explanation
Correct answer: A.
Choice A is the best answer. The convention being tested is subject-verb agreement. The plural verb “explore” agrees in number with the plural subject “Barrada’s pieces.”
Why the other choices are wrong
Choice B
Choice B is incorrect because the singular verb phrase “has explored” doesn’t agree in number with the plural subject “Barrada’s pieces.”
Choice C
Choice C is incorrect because the singular verb “explores” doesn’t agree in number with the plural subject “Barrada’s pieces.”
Choice D
Choice D is incorrect because the nonfinite participle “exploring” doesn’t supply the main clause with a finite verb.