8g of X2O3, and oxide of element X, contains 5.6g of X. How many moles of X does...

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...5.6g of the element contain? 8g of X2O3, and oxide of element X, contains 5.6g of X. How many moles of X does 5.6g of the element contain?

a) 2.4/16 x 2/3
b) 2.4/16 x 3/2
c) 8/16 x 2/3
d) 8/16 x 3/2

Please explain your answer, because i couldn't get any workings from the answer key as its a multiple question.
Thank you very much! (:
 
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