Wave length of visible radiation ranges between:

Correct option is A

The visible radiation (or visible light) spectrum lies in the range of approximately 0.38 to 0.78 microns (µm), which falls within the broader option 0.15 to 4.0 µm.
Though 0.15 µm includes part of ultraviolet and 4.0 µm enters into the infrared range, this option encompasses the visible band, making it the closest correct choice.
Explanation:
0.15 to 4.0 µ – Correct answer. Encloses the visible range (0.38–0.78 µm) along with nearby bands.
(b) 4.0 to 6.5 µ – Lies entirely in the infrared region, not visible light.
(c) 6.5 to 9.5 µ – Also part of thermal infrared, used in remote sensing.
(d) 9.5 to 14.5 µ – Further into the infrared spectrum, beyond visible light.