Which of the following is a measurement conversion that you may need to make when comparing energy and mass in nuclear reactions? (A) degrees Celsius to Kelvin (B) grams to tons (C) kilojoules to joules (D) meters per second to miles per hour

The correct option is C. In Nuclear reactions, two nuclear particles collide to produce products that are different from the reactants. During nuclear reaction, a lot of processes take place. In nuclear reactions, the total energy is conserved. Thus, the missing rest mass energy can be accounted for by using the Einstein's formular to find mass - energy equivalence.