An element, X has the following isotopic composition; <br> $^{200}X : 90 \%$ <br> $^{199}X : 8.0 \%$ <br> $^{202}X : 2.0 \%$ <br> The weighted average atomic mass of the naturally - occurring element X is closest to :

Question

( A ) 200 amu
( B ) 199 amu
( C ) 201 amu
( D ) 202 amu