Given the Equation , Which Answer or Answers Provide(s)

Multiple Choice

Given the equation , which answer or answers provide(s) the best description of a possible physical situation?

A) A 20.00 N tension pulls a 2.00 kg mass. The 2.00 kg mass pulls another 2.00 kg mass.
B) A 20.00 N force pushes a 2.00 kg mass. The 2.00 kg mass pushes another 2.00 kg mass.
C) A 2.00 kg mass on a flat surface is acted on by gravity while another 2.00 kg mass sits on top of it.
D) All of the situations above are possible.
E) Only (a) and (b) above are possible.