A man suffers a head injury in a car accident. For several days afterward, he has difficulty remembering phone numbers. This loss of memory results from damage to the man's?

cerebrum

Explanation:

From the given scenario of the question, as the man suffers from head injury, the loss of his memory, indicates that there is damage in the man's cerebrum.

As,

In the human brain, cerebrum is the largest part of brain, which is responsible for memory, like the things which the body is supposed to remember.

Hence, from the given information of the question, cerebrum of the man got damaged.