Answer:

[tex]\huge{✏Problem}[/tex]

Particles where motions are better described by quantum mechanics can only gain or lose energy in discrete units called?

[tex]\huge{✏Answer}[/tex]

[tex]B. \: Quanta[/tex]

[tex]\huge{✏Explanation}[/tex]

Particles whose motion is better described by quantum mechanics can only gain or lose energy in discrete units called quanta.