Select the option that expresses the given sentence in passive voice.

She handles all tasks efficiently.

All tasks are handled efficiently by her.

The correct passive voice form of the given sentence "She handles all tasks efficiently" is All tasks are handled efficiently by her.

The active voice of the sentence is "She handles all tasks efficiently." This sentence is in the present simple tense, which is used to describe an action that happens regularly or happens now. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the present participle of the main verb. In this case, the subject of the active sentence is "tasks" and the main verb is "handle." The present participle of "handle" is "handling." So, the passive form of the sentence is "All tasks are handled efficiently by her."

The other options are incorrect because:

• All tasks were handled efficiently by her." This sentence is in the simple past passive voice, which is used to describe an action that happened in the past. However, the action of handling the tasks is not finished.
• All tasks have been handled efficiently by her." This sentence is in the present perfect passive voice, which is used to describe an action that has happened in the past and is still relevant to the present. However, the action of handling the tasks is not relevant to the present.
• All tasks are being handled efficiently by her." This sentence is in the present progressive passive voice, which is used to describe an action that is happening now but is not finished. However, the action of handling the tasks is not happening now.