Which choice completes the text so that it conforms to the conventions of Standard English?
A
were
B
is
C
was
D
has been
Explanation
Correct answer: A.
Choice A is the best answer. The convention being tested is subject-verb agreement. The plural verb “were signed” agrees in number with the plural subject “the treaties.”
Why the other choices are wrong
Choice B
Choice B is incorrect because the singular verb “is signed” doesn’t agree in number with the plural subject “the treaties.”
Choice C
Choice C is incorrect because the singular verb “was signed” doesn’t agree in number with the plural subject “the treaties.”
Choice D
Choice D is incorrect because the singular verb “has been signed” doesn’t agree in number with the plural subject “the treaties.”