Which describes the greatest displacement? a) walking 3m east, then walking 3m north, then 3m west b) walking 3m east, then 3m south, then 3m north c) walking 3m north, then 3m south, then walking 3m north d) walking 3m north, then 3m west, then 3m south you!

These choices produce displacements in different directions, but the magnitude of the displacement is 3m for each choice. None of the choices produces a displacement that's longer or shorter than any other choice.

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.

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