Why Does Arabidopsis Have 5 Genes That Code for Phytochrome

Why does Arabidopsis have 5 genes that code for phytochrome?

A) They mediate different types of responses to red/far-red light.
B) Several of them sense red light and the others sense far-red light.
C) All 5 phytochrome absorb different types of light,maximizing sensitivity of plant to it.
D) Some of the phytochromes do not function in light absorption,but regulate other processes.