D

Step 1: Understand the nature of the spectrum produced by iodine gas when it absorbs white light.
Step 2: Iodine, being a diatomic molecule, has specific electronic transitions that occur when white light passes through it. It absorbs certain wavelengths of light, particularly in the visible region.
Step 3: When white light is shone through iodine gas, it absorbs some of the wavelengths, leaving gaps (or bands) in the spectrum. This results in a continuous spectrum with certain wavelengths removed, forming dark lines or bands. This phenomenon is referred to as an absorption spectrum.
Step 4: Therefore, the correct representation of the spectrum of iodine gas under white light will show dark bands within a continuous spectrum.
Conclusion: The correct answer is that iodine gas will produce some black bands in the continuous spectrum.
Therefore, D.