Context: Read the passage. Then answer the question.

Hawk moths visit many types of plants to find nectar, including petunias. Petunias produce nectar deep inside their flowers. To reach the nectar, a moth puts its long, tubular mouthpart, called a proboscis, inside a flower. While the moth drinks nectar, pollen from the flower sticks to the moth's head and proboscis.
Later, the moth visits another petunia flower to drink more nectar. When pollen on the moth's head and proboscis is transferred to the female part of the other flower, that flower is pollinated. After the moth pollinates the flower, the petunia is able to reproduce.
Figure: a hawk moth visiting a petunia flower.
Which type of relationship is formed when a hawk moth visits a petunia flower?
A. commensal
B. mutualistic
C. parasitic
Select the correct answer from the given choices and respond with the letter of the chosen option.
Answer: B