In Plant Research Labs, Plants Are Often Grown in Light-Proof

In plant research labs, plants are often grown in light-proof chambers where the hours of light and dark are carefully controlled. A new researcher goes into a chamber and accidentally turns on the light during the "dark" period. What is likely to happen?

A) If the plants are short day plants, there will be no impact.
B) If the researcher can quickly produce a flash of far-red light and close the door, there will be no impact.
C) If the plants are not yet flowering, there will be no impact.
D) If the light is only red light and not far-red light, there will be no impact.