Question

form, structure, and sense: medium
google classroom microsoft teams
studying the deepest parts of the ocean is a daunting task. humans cannot
survive the crushing pressure, freezing temperatures, and lack of light that
characterize whats called the \abyssal zone\. specially designed
submarines and robots can explore this realm, but highly expensive
and limited by technical challenges.
which choice completes the text so that it conforms to the conventions of
standard english?
choose 1 answer:
a it is
b they are
c we are
d this is

Explanation:

The subject of the sentence is "specially - designed submarines and robots", which is plural. The pronoun should agree with the plural subject. "It is" and "this is" are singular. "We are" is incorrect as the subject is not "we". "They are" correctly refers to the plural "submarines and robots".

Answer:

B. they are