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?

A is correct.

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To determine the tense of a verb, we can look at its suffix. In this case, the verb "worked" ends with the suffix "-ed." The "-ed" suffix is commonly used to form the past tense of regular verbs. Therefore, the correct answer is indeed A. The work happened in the past tense.