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Let \( m_{p} \) be the mass of a proton, \( m_{n} \) the mass of a neutron, \( M_{1} \) the mas of a \( { }_{10}^{20} \mathrm{Ne} \) nucleus and \( M_{2} \) the mass of a \( { }_{20}^{40} \mathrm{Ca} \) nucleus. Then
(A) \( \mathrm{M}_{2}=2 \mathrm{M}_{1} \)
(B) \( \mathrm{M}_{2}2 \mathrm{M}_{1} \)
(C) \( \mathrm{M}_{2}2 \mathrm{M}_{1} \)
(D) \( \mathrm{M}_{1}10\left(m_{n}+m_{p}\right) \)
\( \mathrm{P} \)
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