The correct answer is: a) Ghat roads.
Ghat roads are a type of road that is built on the sides of hills or mountains. They are often narrow and winding, and they can be very steep. Ghat roads are an important part of the transportation infrastructure in Kerala, as they provide access to the state’s hilly regions.
Ropeway transportation is a type of transportation that uses a cable car to transport people or goods over a long distance. Ropeway transportation is often used in mountainous areas, as it is a safe and efficient way to travel over difficult terrain.
Helicopter services are a type of transportation that uses a helicopter to transport people or goods. Helicopter services are often used in remote areas, as they are a quick and efficient way to travel.
However, in Kerala, ghat roads are the most common type of transportation in the hilly regions. They are used by both locals and tourists to travel to and from the hills. Ghat roads are also used to transport goods and supplies to the hills.
Ropeway transportation and helicopter services are also available in Kerala, but they are not as common as ghat roads. Ropeway transportation is often used by tourists to get a bird’s eye view of the hills, while helicopter services are often used by businesses and government agencies to transport people and goods to remote areas.