Which of the following is the longest highway _____________?

A. Karakoram Highway
B. Trans-Canada
C. Highway 401
D. Leh-Manali Highway

1. The Karakoram Highway is a 1,300-kilometre national highway which extends from Hasan Abdal in the Punjab province of Pakistan to the Khunjerab Pass in Gilgit-Baltistan.
2. The Trans-Canada Highway between Victoria (BC) and St. John’s (NF) is the world’s longest national highway with a length of 7,821 km (4,860 mi.)
3. Ontario Highway 401, also called King’s Highway 401, is a provincial highway in southern Ontario, Canada. It is 817.9 kilometres (508.2 miles) long.
4. The Leh-Manali Highway is a high mountain road situated in India. It spans over a length of 479 km (298 mi) among the Himalaya mountain range.

The Pan American Highway, which encompasses the entire US interstate highway system, is the world’s longest highway covering a length of approximately 48,000km.