science help pls pls

Which of the following types of stars is cooler than an orange main sequence?

In Graph A, the curve peaks at 800 nm, in the red section of the visible light spectrum. In Graph B, the curve peaks at 550 nm, in the green section of the visible light spectrum. In Graph C, the curve peaks at 450 nm, in the blue section of the visible light spectrum. In Graph D, the curve peaks at 300 nm, in the violet section of the visible light spectrum.

A
B
C
D

pls help me

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  1. It is A because I guess and got it right.

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