Radium-226 Decays into Radon-222 Plus an Alpha Particle ${ } _ { 2 } ^ { 4 } \mathrm { He } : \quad 4.002603 \mathrm { u }$

Multiple Choice

Radium-226 decays into radon-222 plus an alpha particle. The relevant masses are ${ } _ { 2 } ^ { 4 } \mathrm { He } : \quad 4.002603 \mathrm { u }$
$\begin{array} { l l } { } _ { 86 } ^ { 222 } \text { Rn: } & 222.017570 u \\ { } _ { 88 } ^ { 226 } \text { Ra: } & 226.025402 u \end{array}$
How much energy is released in this process? $\left( 1 \mathrm { u } = 931.5 \mathrm { MeV } / \mathrm { c } ^ { 2 } \right)$

A) $4.87 \mathrm { MeV }$
B) $5.39 \mathrm { MeV }$
C) $3.76 \mathrm { MeV }$
D) $5.05 \mathrm { MeV }$
E) $4.24 \mathrm { MeV }$