Transform "She finished the project on time" into passive voice.

In transforming the sentence "She finished the project on time" into passive voice, the focus shifts from the subject (she) to the object (the project). The correct passive construction must use the appropriate form of the verb "to be" followed by the past participle of the main verb, which in this case is "finish."

The correct answer, which states, "The project was finished by her on time," appropriately uses the past simple tense of the verb "to be" (was) to align with the original sentence's past tense. It also includes the past participle "finished," and retains the adverbial phrase "on time" to convey the timing of the completion.

Additionally, this option ensures that the sentence remains grammatically correct while accurately reflecting the original meaning, effectively conveying that the project was completed by her within the expected timeframe. The use of "was" helps to indicate that the action occurred in the past, which is crucial for maintaining the context of the original statement.