Why Do Ant-Plants Invest in Nectaries and Protein/lipid Food Bodies

Why do ant-plants invest in nectaries and protein/lipid food bodies on young leaves?

A) It encourages the ants to visit the plant tissues most vulnerable to herbivory.
B) It helps keep the ants away from floral nectaries, where they might attack pollinators.
C) It moves the sources of nutrition away from the parts of the plant that provide the ants' physical shelter, encouraging them to patrol the intervening stems.
D) Leaves of all plants have foliar nectaries and feeding bodies to some degree, and therefore the foliar location may not have adaptive significance.