You have been playing the piano since you were five years old. when asked to play a relatively easy piece, like chopsticks, you do so with very little effort. during this performance, your is active.
a) dorsal premotor cortex
b) supplementary motor area
c) premotor cortex
d) ventral premotor cortex

B) Supplementary motor area.  

Explanation:

The supplementary motor area is the part of the brain that controls the movements in the body. It just located at the mid-line surface area of the brain. In human beings, this area is not apparent. The SMA area is direct projects the neurons in the spinal cord that sent the message to the brain and play a role in controlling the movement of the body. It controls the external movement of the body and the postural stability of the body. It controls the movement on both sides of the body and controls the sequence of the movement.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.