Consider the oxides of group 14 elements Si O _ 2 , Ge O _ 2 , Sn O...

All members of group 14 when heated in oxygen form oxides. There are mainly two types of oxides, i.e., monoxide and dioxide of formula $MO$ and ${MO}_{2}$ respectively. $SiO$ only exists at high temperature. Oxides in higher oxidation states of elements are generally more acidic than those in lower oxidation states. The dioxides ${CO}_{2}, {SiO}_{2}$ and ${GeO}_{2}$ are acidic, whereas ${SnO}_{2}$ and ${PbO}_{2}$ are amphoteric in nature. Amongst monoxides, $CO$ is neutral.

Hence option C is the answer.