The answer is methamphetamine
I can't decide between A and B, but B seems more likely to me. Even though the molecules don't look like they're moving, the area of contact is slightly more compressed.
The visible<span> light </span>spectrum<span> is a fractional </span>part of the electromagnetic spectrum, which is visible<span> due to our eyes, which are light receptors. </span>Invisible spectrum<span> are things like UV </span>spectrum<span> which falls outside the human </span>visible<span> range.</span>
