A Gardener pulls a 50 kg roller along level ground, as shown in the picture. The handle of the roller makes a 30°
angle to the horizontal ground, and the gardener pulls with a
force of 300 N along the handle.
What is the horizontal component of the 300 N force?

Gas will most likely  fill the container 

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

True will be your answer dude