The Stilwell Road, built in the 1940s, connects Ledo in India and Kunming in China via Myanmar. Therefore, Option 2 is the correct answer.

The Stilwell Road, also known as the Ledo Road, was a historic construction project during World War II. It was built under the leadership of General Joseph W. Stilwell, an American general who served in the China-Burma-India Theater of the war. The road was intended to provide a strategic supply route from India to China, bypassing the Japanese-controlled areas of Burma (now Myanmar) and facilitating the transport of military supplies and equipment.

The road starts from Ledo in the northeastern state of Assam in India and stretches across the rugged terrains of northern Burma (Myanmar) before reaching Kunming, the capital city of Yunnan Province in southwestern China. This route enabled the Allies to transport vital supplies, including weapons, ammunition, and other essential goods, to support the Chinese forces fighting against the Japanese invasion.

The Stilwell Road covered a total distance of approximately 1,726 kilometers (1,072 miles), traversing challenging terrains such as dense jungles, mountains, and rivers. The construction of the road involved significant engineering challenges, including the building of bridges and overcoming natural obstacles.

Although the road served its purpose during the war, it fell into disrepair after the conflict ended. Over the years, efforts have been made to revive and upgrade sections of the Stilwell Road to improve connectivity and facilitate trade between India, Myanmar, and China. However, it is worth noting that as of my knowledge cutoff in September 2021, the Stilwell Road had not been fully restored, and its functionality remained limited.

In conclusion, the Stilwell Road connects Ledo in India and Kunming in China via Myanmar.