14 g of element X combine with 16 g of oxygen. On the basis of this information, which of the followings is a correct statement?

Option-1 If Aw of "X" is 7 then it must be lithium (Z=3).The formula of its oxide would be Li2O(X2O) but not XO.Option-2 If Aw of 'X' 14 then its formula cannot be X2O because according to given data 14g of 'X' react with 16g of 'O' but actually in X2O, 28g of 'X' is combining with 16g of 'O'.Option-3 If Aw of 'X' is 7 then it must be lithium (Z=3).The formula of its oxide would be Li2O(X2O)              Here 14g of 'X' combines with 16g of 'O'.