Based on the options above, I see how the last option would actually be most fitting to how "the part of the electromagnetic spectrum that is visible to the human eye". This would be in separate parts, which would be divided into a certain number, which would actually be only 7 ranges of wavelengths. And therefore, this last statement would actually go very well and it would actually be the correct answer. And this would all relate to how the part of the electromagnetic spectrum that is visible to the human eye, it's based on it's own 7 division parts that it has.
Your answer: [tex]\textsf{It is divided into seven ranges of wavelengths}[/tex]
