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

My son learns his lessons every day.

His lessons are learnt by my son every day.

The correct passive voice of the given sentence is His lessons are learnt by my son every day.

The active voice of the sentence is My son learns his lessons every day. This sentence is in the simple present tense, which is used to describe an action that happens regularly. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "my son" and the main verb is "learn." The past participle of "learn" is "learnt." So, the passive form of the sentence is His lessons are learnt by my son every day.

The other options are incorrect because:

• His lessons got learnt every day by my son. is in the passive voice, but the verb "got" is not used with the past participle of the verb "learn."
• His lessons is learnt by my son every day. is grammatically incorrect. The subject of the passive sentence is singular, so the verb "is" should be "are."
• His lessons do learn every day by my son. is in the active voice, but the verb "do" is not used with the past participle of the verb "learn."
• His lessons learn every day by my son. is grammatically incorrect. The verb "learn" does not take an object, so the word "his lessons" should not be present in the sentence.