Correct Answer: The charity function is being organised tomorrow.

Solution : The correct choice is the second option.

Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the active sentence becomes the subject in the passive voice.

The structure of the passive voice in the case of the present continuous tense is: " Singular object + is + being + past participle form of the main verb + time reference."

Therefore, the sentence in passive voice is: "The charity function is being organised tomorrow."