20. In which of the following is electromagnetic radiation listed correctly in increasing order of wavelength (lowest wavelength first)?

(A)X-rays ＜ infrared ＜ ultraviolet

(B)Microwave ＜ visible ＜ infrared

(C)Visible ＜ microwave ＜ infrared

(D)Ultraviolet ＜ visible ＜ infrared

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