Explanation:

Let’s break down the options as per the Motor Vehicles Act, 1988:

- Option 1: twenty – This is not correct; the prescribed age is lower.

- Option 2: eighteen – This is for regular motorcycles with gear and other vehicles, not for motorcycles without gear.

- Option 3: seventeen – Still not the right age for motorcycles without gear.

- Option 4: twenty-one – This is the age for transport or heavy vehicles, not for motorcycles without gear.

?? Correct Answer: Option 3, seventeen

- As per Section 4 (1), no person under 16 years of age shall be granted a learner’s license to drive a motor cycle without gear, but with written consent, it may be granted at 16.

- For motorcycles with gear or cars, the minimum age is 18 years.

- 21 years is the minimum for heavy transport vehicles.

So, the correct answer is seventeen and .