Here's a problem to solve: Nectar is a sweet liquid that some flowering plants produce. A hummingbird drinks nectar from a flower. When a hummingbird drinks nectar, pollen from the flower sticks to the hummingbird's beak. The picture shows a hummingbird drinking nectar from a flower. Which statement explains the role of a hummingbird in the life cycle of a flowering plant?

Among the 4 following options, which is the correct answer?

- A: A hummingbird carries food to the plant.
 
- B: A hummingbird helps the plant reproduce.
 
- C: A hummingbird protects the plant from predators.
 
- D: A hummingbird makes the flowers produce nectar.
 