Correct Answer: Multimedia is used by Mr. Ram for teaching the children.

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 acts. Hence, the object in the active sentence becomes the subject in the passive voice.

The structure of the passive in the case of the simple present tense is: Singular object + is + past participle form of the main verb + 'by' followed by the agent of the action + additional phrases.

Therefore, the correct passive voice sentence is: Multimedia is used by Mr. Ram for teaching the children.