Mercury has less mass than earth. So the answer is B
Efficiency- How much energy is wasted and how much useful energy is produced
Money- How expensive to install them
Location- She has to consider the location where she places them so that there is enough sunlight and light energy for the solar panels, obviously she should have solar panels if the location receives a sufficient amount of sunlight
It’s c.) I think so at least
As we know that :

Power, is in Meter. So divide focal length by 100

1. Volume of the solution (B)
2. Celery (D)
3. Hydroxide ions in solution (A)