In the passive voice, the focus shifts from who performs the action to what receives it. To transform an active sentence into a passive one, the object of the active sentence becomes the subject; the verb is formed with the appropriate tense of the verb "to be" + the past participle of the main verb; and the original subject (the agent) may be introduced by "by," when relevant. The verb tense of the active sentence must be preserved in the passive construction.

Consider the following sentence in the active voice:

"The manager approved the new project last week."

Mark the alternative that correctly transforms the sentence above into the passive voice.