The Moreh border crossing connects Manipur to which town in Myanmar?

The correct answer is Tamu.

The Moreh border crossing connects Manipur to Tamu, a town in Myanmar. It is the only overland border crossing between India and Myanmar. The town is located in the Sagaing Region of Myanmar, about 100 kilometers from the Indian border. Tamu is a major trading center between India and Myanmar. The town is also home to a number of Indian and Burmese businesses.

The other options are incorrect. Mandalay is a city in central Myanmar. Yangon is the largest city in Myanmar. Naypyidaw is the capital of Myanmar.