Which of the following events is most likely to occur in the fetus during the third trimester

of pregnancy?
A. Growth in length of the body accelerates, but growth of the head slows.
B. The bones of the skeleton begin to form, and fetal legs grow and develop.
C. Fetal brain cells form rapidly, connecting to form more intricate networks.
D. The cartilage-based skeleton begins to harden

D. The cartilage-based skeleton begins to harden