When millions of rods in our eyes are at work in darkness we call see

A．some may see everything in shades of green
B．few can tell tile difference between blue and green
C．few may think that red, orange and yellow are all shades of green
D．very few may think that everything in the world is in green

A．if the patient is young
B．at the early stage of the disease
C．when plants are in bad
D．if the patient goes to see a psychologist