I think it is B as 168/20
A.
The planet contains matter and energy so it is a system.
Answer: The electromagnetic force, also called the Lorentz force, acts between charged particles, like negatively charged electrons and positively charged protons. Opposite charges attract one another, while like charges repel. The greater the charge, the greater the force.
Explanation:
I would read Choice #2 to him, enunciating clearly.