The major function of the limbic system is to determine emotional responses (option c). The limbic system is a group of brain structures that play a crucial role in the regulation of emotions, motivation, learning, and memory. Some of the structures that make up the limbic system include the amygdala, hippocampus, hypothalamus, and the cingulate gyrus.

The amygdala is responsible for processing emotions, especially fear and aggression, while the hippocampus plays a crucial role in memory and learning. The hypothalamus is responsible for regulating autonomic functions such as hunger, thirst, and body temperature, as well as the release of hormones related to stress and emotions.

While the limbic system is involved in many different aspects of brain function, it is primarily responsible for determining emotional responses. It helps us to recognize and respond to potential threats, as well as to experience positive emotions such as joy and happiness. Therefore, options a, b, and d are incorrect as they do not describe the primary function of the limbic system.