The correct choice is (a) 5.54 x 10^9 kgs^-1
The best explanation: As we know from Einstein’s mass energy relation, E = mc^2.
Therefore, ΔE = Δmc^2
ΔE = 5 x 10^20 Js^-1, c = 3 x 10^8 ms^-1.
Δm = 5 x 10^20 Js^-1/ 9 x 10^16m^2s^-2
Δm = 5.54 x 10^3 kgs^-1.