Answer:B. hippocampus
Explanation: Hippocampus is one of the major component part of the brain in vertebrates,it is the main regulator of EMOTIONS, MOTIVATION,MEMORY AND LEARNING.
Generally, mammals have two Hippocampi which are located on both the left side of the brain and on the right side of the brain.
WHEN THE HIPPOCAMPI IS DAMAGED,THE PERSON INVOLVED WILL EXPERIENCE MEMORY LOSS AND HE OR SHE MAY NOT BE ABLE STORE INFORMATION FOR LONG TIME.