Astudent solved this problem and said the answer was 78.

there were 171 people who came to the play in the afternoon. in the evening, there were 93 more people at the play than in the afternoon. how many people came to the play in the evening?

which estimation strategy correctly checks whether the student’s answer is reasonable?

a.
the student’s answer is reasonable. estimation: 170 – 90 = 80

b.
the student’s answer is not reasonable. estimation: 170 + 90 = 260

c.
the student’s answer is not reasonable. estimation: 175 + 100 = 275

d.
the student’s answer is not reasonable. estimation: 200 – 100 = 100