In a nuclear power plant, the nuclear reaction is kept from going critical by keeping the rate of reaction safe. how do the control rods figured into this?
a. the control rods absorb excess neutrons, keeping them from causing too many uranium atoms to split too quickly
b. control rods absorb the excess heat produced in the reaction
c. the controls provide additional neutrons to keep the reaction going
d. the control rods absorb excess uranium atoms so that the reaction doesn't happen too quickly