Which of the Following Correctly Describes the Patterns of Flowering

Which of the following correctly describes the patterns of flowering in bearded irises and chrysanthemums?

A) Bearded irises flower when the night is shorter than a critical length, and chrysanthemums also flower when the night is shorter than a critical value.
B) Bearded irises flower when the night is longer than a critical length, and chrysanthemums also flower when the night is longer than a critical value.
C) Bearded irises flower when the night is longer than a critical length, whereas chrysanthemums flower when the night is shorter than a critical value.
D) Bearded irises flower when the night is shorter than a critical length, whereas chrysanthemums flower when the night is longer than a critical value.