Willa gets regular headaches. While pregnant, Willa begins using aspirin to ease the pain because she is convinced that aspirin is harmless. Which of the following effects can Willa's regular aspirin use have on the developing organism?

A) None. Aspirin use is completely safe during pregnancy.
B) Aspirin can cause gross deformities of the arms and legs during the embryonic period.
C) Regular aspirin use is linked to low birth weight and poorer motor development.
D) Even moderate aspirin use is linked to elevated incidence of birth complications, including respiratory distress.

C