The graph illustrates how the concentration of antibodies in a baby's blood changes before birth and throughout the first few months after birth. Which statement correctly describes the changes in immunity during the first few months after birth?
- Aactive artificial immunity decreases, active natural immunity increases
- Bactive natural immunity decreases, active artificial immunity increases
- Cpassive artificial immunity decreases, active natural immunity increases
- Dpassive natural immunity decreases, active natural immunity increases