A gardener grows Asters, a long-day plant, in his greenhouse. This plant grows well in summer. Which method will help ensure that the Asters grow all year round?

A. Break the darkness period with a flash of light for some time, so that the plants can bloom all year round.

B. Break the light period with complete darkness for some time, so that the plants can bloom all year round.

C. Increase the shade in the greenhouse so that the plants can bloom all year round.