A physical quantity is represented by $\mathrm{X}={\mathrm{M}}^{\mathrm{a}}{\mathrm{L}}^{\mathrm{b}}{\mathrm{T}}^{\mathrm{c}}$. If percentage errors in the measurement of M, L and T  are  $\mathrm{\alpha }, \mathrm{\beta }\mathrm{and} \gamma$ respectively, then total percentage error is

• A

  $\left(\mathrm{\alpha a}+\mathrm{\beta b}-\mathrm{\gamma c}\right)$

• B

  $\left(\mathrm{\alpha a}+\mathrm{\beta b}+\mathrm{\gamma c}\right)$

• C

  $\left(\mathrm{\alpha a}-\mathrm{\beta b}+\mathrm{\gamma c}\right)$

• D

  Zero