The correct answer is C. Hippocampus.
Explanation
The hippocampus is a brain structure that is located in the temporal lobe of each cerebral cortex. It is an important part of the limbic system. In this area of the brain stimuli, emotions, learning, and memory are regulated. Likewise, in this region, adult neurogenesis takes place, a process in which new neurons are produced. According to the above, the complete paragraph of the question would be:
Thought I was once believing that we were born with all of the neurons we would ever have, recent research suggests that neurogenesis continues in the hippocampus, an area of the brain that is important for learning and creating new memories.
According to the above, the correct answer is C. Hippocampus.
