I think the question can be rephrased like this: which of the following forms are forms of "to be", which is a linking verb.
and the answer is B:
all in present:
am - first person singular
is- third person singular
are - plural
and the forth form:
was - simple past
Create an accurate summary of the "good-bye" scene between marilyn and her brother in "the cold equations." provide your answer in three to five sentences.
Answer:
A
Ricardo had read a children’s story with a character named “Tom Thumb,” so he understood the author’s description of the “tiniest” black holes.