What is the function of the cervical enlargement of the spinal cord?

A)It contains extra gray matter to provide the necessary innervation to the upper limbs.
B)It provides extra innervation to the heart and lungs.
C)It contains extra gray matter to provide the necessary innervation to the lower limbs.
D)It provides a large amount of neurons to control the postural muscles of the back.
E)It contains many neurons to provide accurate sensation to all areas of the trunk.