Which statement about endothermic reactions is correct?
a.
energy is always created in the form of heat.
b.
energy is transferred from the surroundings to the reactants.
c.
energy is used to force electrons to move to higher energy levels.
d.
energy is transferred from the reactants to the surroundings.

B.) Energy is transferred from the surroundings to the reactants.

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 sun's gravitational pull is weaker on the planets that are closer to it, i think.