You have collected a tissue specimen that you would like to preserve by freeze drying. To ensure the integrity of the specimen, the temperature should not exceed − 3.00 ∘C. The vapor pressure of ice at 273.16 K is 624 Pa; ΔHfus=6.008kJ⋅mol−1 and ΔHvap=40.65kJ⋅mol−1.What is the maximum pressure at which the freeze drying can be carried out?

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

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.