Jill Plants Flowers in Her Yard to Supply a Local

Jill plants flowers in her yard to supply a local florist. Her neighbor is enjoying the flowers. Therefore:

A) Jill should stop planting flowers because her neighbor does not pay for the benefit he gets.
B) Jill should not plant flowers because their economic value is low and opportunity cost is high.
C) Jill should plant fewer flowers because the external cost is greater than the external benefit.
D) Jill is creating an external benefit for her neighbor.