plant has plant = plant
What? I mean, like, males (in this case, option C) are necessary when it comes to reproduction, so I would say C since there is no option for a woman/mother. Babies do come from a male, but not in the form of an actual child.
Babies definitely don't come from plants or birds (i'm not going to bring religion into this) if you're talking about human offsprings.
What an odd question...
Have a nice day! :D