Some Types of the Thynnine Wasps Pollinate the Elbow Orchid

Some types of the thynnine wasps pollinate the elbow orchid when

A) males carry wingless females to elbow orchid flowers, where the female pollinates the flower.
B) females carry wingless males to elbow orchid flowers, where the males pollinate the flower.
C) elbow orchid flowers imitate the smell of females and trick males into transporting pollen.
D) elbow orchid flowers imitate the smell of males and trick females into transporting pollen.