Please Help!!!
 Shondra takes notes in class.
 I. Electromagnetic Waves
 II. The ability to work
 - Has many forms
 - Mechanical 
 III. Potential energy
 - Chemical
 - Elastic
 - Gravitational
 Kinetic energy
 - Energy of movement
 - Electrical 
 IV. Nuclear
 - Radiant
 - Thermal
 One line of Shondra’s notes is irrelevant to the rest of her notes. Which line is about a different topic than the rest of Shondra’s notes?
 A - I
 B - II
 C - III
 D - IV