Which of the Following Is an Explanation as to Why

Which of the following is an explanation as to why a newborn's body lacks easy mobility?

A) The baby's head is disproportionately larger than its body.
B) Babies cannot get enough nourishment to increase their strength.
C) The baby's limbs are relatively long in relation to the rest of the body.
D) Babies' bodies are mostly muscle,so they lack the flexibility to pick their head up.