Who Would Be Most Accurately Described as Showing Voluntary Childlessness

Who would be most accurately described as showing voluntary childlessness?

A) Paula,who does not have children although she is of child bearing age
B) Pam,who is unsure whether she could afford to parent one or more children
C) Kayla,who adopted an infant who had been a ward of the state
D) Karli,who froze her eggs so that she can decide whether to get pregnant later in life