Asked by Ms. Sue Please help me

She worked really hard on the project.

The suffix -ed in the italicized word in the sentence above illustrates that the work happened in the ______ tense.
A. past
B. past-perfect
C. future
D. future-perfect

B is wrong. Is it A?
Answered by Writeacher
A is correct.

Please don't switch your screen name. We know who you are!!
Answered by Ms. Sue Please help me
Thank you so much :D