Which of the following parts of the mammalian brain is involved in taking the decision to run rather than walk?

The part of the mammalian brain that is involved in taking the decision to run rather than walk is the "Cerebrum." The cerebrum is the largest part of the brain and is responsible for conscious thought and voluntary movements. It is divided into two hemispheres, each of which is responsible for controlling the opposite side of the body. When a mammal is faced with a situation that requires quick action, such as the need to run away from a predator, the cerebrum receives sensory input from the eyes, ears, and other sensory organs, and processes this information to make a decision. The cerebrum then sends signals to the muscles of the legs and other parts of the body to initiate the appropriate movement, which in this case would be running. Therefore, the correct option is: "Cerebrum" is the part of the mammalian brain involved in taking the decision to run rather than walk.