Explanation:

Let’s break down the options about the total length of National Highways in India as per the Annual Report 2020-21:

- Option 1: 136,440 km

This was true for earlier years, but by 2020-21, the number actually increased.

- Option 2: 178,300 km

That figure is too high for 2020-21; the network hadn’t hit that yet.

- Option 3: 145,500 km

This came closer to a previous year’s data, but not for 2020-21.

- Option 4: 162,700 km

_This is the right answer._ The Ministry’s 2020-21 Annual Report mentions the total National Highways length as approximately 162,700 km.

So, your answer (136,440 km) is out of date based on recent data.