What is the percentage of $$MgCO_3$$ in a mixture of $$MgCO_3$$ and $$CaCO_3$$ if $$2$$ g of the mixture requires $$2$$ g of $$H_2SO_4$$ for complete neutralization

A

$$89\%$$

B

$$11\%$$

C

$$50\%$$

D

$$25\%$$