To Which Anatomic Structures Do the Ventral Respiratory Centers Send

To which anatomic structures do the ventral respiratory centers send motor signals during inspiration?
1) Diaphragm
2) Larynx
3) Pharynx
4) Sternocleidomastoids

A) 1, 2, and 3 only
B) 2 and 4 only
C) 1 only
D) 1, 2, and 4