Question

Andrea is planning on traveling around the world. She intends to visit each place only once, and she will travel alone. Her parents decide to pay for her plane tickets. She still has lodging costs and other miscellaneous expenses to consider. She has friends in each place that she plans to travel to, so her lodging costs are also taken care of. Which of these is a random variable in this scenario?
the number of places she plans to visit
her miscellaneous expenses at the places she stays
the number of times she visits the same place
the number of friends she travels with