Which of the following radioactive emissions is the most penetrating?

alpha particles
beta particles
gamma rays

Gamma rays are the most penetrating radioactive emissions. The correct answer is C. 

Iwould sure like to answer your question but i honestly just don’t know

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