The correct answer is: c) Both lower temperatures and higher rainfall.
Hilly regions experience lower temperatures compared to the plains because the air is thinner at higher altitudes. This means that there is less air to trap heat, so the temperature drops. Hilly regions also experience higher rainfall compared to the plains because the air is forced to rise as it moves over the hills. This causes the air to cool and condense, forming clouds and rain.
Option a is incorrect because hilly regions do not always experience lower temperatures than the plains. For example, the hilly regions of Andhra Pradesh can experience temperatures that are higher than the plains during the summer months.
Option b is incorrect because hilly regions do not always experience higher rainfall than the plains. For example, the hilly regions of Andhra Pradesh can experience lower rainfall than the plains during the winter months.
Option d is incorrect because hilly regions do experience both lower temperatures and higher rainfall than the plains.