The most extensive regions of the brain are involved in higher mental functions such as memory and reasoning. these regions are called the?

Association areas

Explanation:

The association area is one of the region which is located in our brain and It is one of the most extensive area of cerebral cortex.

The function of the association area is that it helps in coordinating all the sensory, reasoning and the memory functions and also control all the motor areas.

The main role of the association area is that it is responsible for managing the thoughts, leaning process, sensory information and also memory in our brain.

 Therefore, Association area is the correct answer.