Researchers have demonstrated changes in the size of certain

Researchers have demonstrated changes in the size of certain brain areas as a result of what?

daydreaming

taking a multivitamin pill each day

extensive practice at playing musical instruments

moving from one time zone to another

A		daydreaming
B		taking a multivitamin pill each day
C		extensive practice at playing musical instruments
D		moving from one time zone to another

As a result of the extensive practice at playing musical instruments, Researchers have demonstrated changes in the size of certain brain areas.