The correct answer is: b) Palakkad Gap.
The Palakkad Gap is a mountain pass in the Western Ghats of India. It is located in the Palakkad district of Kerala and connects the state with Coimbatore in Tamil Nadu. The pass is about 30 kilometers long and is the lowest point in the Western Ghats, with an elevation of just 300 meters. The Palakkad Gap is an important transportation corridor and is used by both road and rail traffic. It is also a popular tourist destination, with several waterfalls and temples located in the area.
The other options are incorrect because they are not mountain passes that connect Kerala with Coimbatore in Tamil Nadu. Aryankavu Pass is a mountain pass in the Western Ghats of India. It is located in the Wayanad district of Kerala and connects the state with Mysore in Karnataka. Shencottah Gap is a mountain pass in the Western Ghats of India. It is located in the Theni district of Tamil Nadu and connects the state with Idukki district of Kerala. Bhor Ghat is a mountain pass in the Western Ghats of India. It is located in the Pune district of Maharashtra and connects the state with Satara district of Maharashtra.