Why is earth considered to be an inner planet?
a- it is located between the sun and the kuiper belt.
b- it is located between the sun and the main asteroid belt.
c- it is the closest planet to the main asteroid belt.
d- it is the closest planet to the sun.

Earth is among many things the largest terrestrial planet in the solar system. All 4 terrestrial planets are considered inner planets because they orbit between the main asteroid belt and the sun. All these inner planets are heavy and mineral rich unlike the outer planets which are gaseous and have many moons. Your answer is B.

Hope this helps!

What does the start look like

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