For problems that involve an object accelerating along an inclined plane, how can the weight be used to determine the force component that causes motion?
The weight is the full force that acts perpendicular to the surface of the ramp.
The weight times the cosine of the ramp's angle is the force perpendicular to the ramp.
The weight times the sine of the angle of the ramp acts down along the ramp.
The weight times the cosine of the angle of the ramp acts down along the ramp.

It should be d if not then c

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

Ifound this answer online hope it