B. Purpose because if you intent something, you have reasons to do it
Digital devices, smartphones included, emit what we call the blue light. It has a wavelength between 380 to 470 nm. This is the only light that can penetrate the retina of the eyes. Hence, prolonged exposure to blue light, especially during at night, will cause damage to the retina resulting to sleep disorders or worst, cataracts.
Yes it is hope this helped
Simple; sub: bugs; verb: are consumed
