The correct answer is: b) Road construction and maintenance expensive
Sikkim is a landlocked state in northeastern India. It is bordered by Bhutan to the north, China to the east, Nepal to the west, and West Bengal to the south. The state has a population of about 610,000 people and a land area of about 7,096 square kilometers.
Sikkim is a mountainous state with a high altitude. The average elevation of the state is about 2,000 meters above sea level. The highest point in Sikkim is Mount Kanchenjunga, which is the third highest mountain in the world.
The challenging mountainous terrain of Sikkim makes road construction and maintenance expensive. The state has a limited network of roads, and many of these roads are in poor condition. This makes it difficult to transport goods and people in Sikkim.
Air travel is the most preferred mode of transport in Sikkim. The state has two airports, one in Gangtok and the other in Pakyong. The airports are connected to major cities in India.
Waterways are not a viable transportation option in Sikkim. The state does not have any major rivers or canals.
Railways are not the primary mode of transport in Sikkim. The state does not have any railways.