Answer:
B. Photo receptors in the eye detect visible light which is part of the wider electromagnetic spectrum
Step-by-step explanation:
Electromagnetic spectrum is wide and huge and a range in this spectrum (around wavelenght 380 to 700 nanometers) is called visible light spectrum which is the only light that our eyes can see.
Thus photoreceptors in eye detect visible light which is part of bigger spectrum (we CANNOT see the entire electromagnetic spectrum only a small range which is known as visible light spectrum range).
I know the answer but the wording is tricky so I am not sure between A and B. Im sorry if I get it wrong. A sounds sort of right but I would not go with it cuz it says receptors detect electromagnetic spectrum (but we DO NOT detect all of the spectrum only a small portion)
Go with your gut.