The mass of the neutron is of the order of.

• A.  \[\text{1}{{0}^{-\text{23}}}\text{ kg}\]     
• B.  \[\text{1}{{0}^{-\text{24}}}\text{ kg}\]
• C.  \[\text{1}{{0}^{-\text{26}}}\text{ kg}\]     
• D.  \[\text{1}{{0}^{-\text{27}}}\text{ kg}\]