Which of the Following Statements Is NOT Correct About a Circadian

Which of the following statements is NOT correct about a circadian rhythm?

A) An example is the opening of stomata in the morning and their closing at night.
B) These rhythms tend to persist even in the absence of daily light cues.
C) If plants are maintained in total darkness or total light,their circadian rhythm acts on a faster time scale.
D) The primary usefulness of circadian rhythms seems to be to measure day-length changes so plants respond appropriately to seasonal environmental changes.