An object is dropped from the top of a building through the air (friction is present) to the ground below. how does its kinetic energy (ke) just before striking the ground compare to its gravitational potential energy at the top of the building?

The answer is a) taiga because taigas are cold

A. to determine if humans can explore mars safely

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current