Metal oxides are basic in nature.

The correct option is A True
Metals on reaction with oxygen gas form metal oxides. The general equation is as follows:

$\mathrm{Metal}\left(s\right)+\mathrm{Oxygen}\left(g\right)\to \mathrm{Metal}\mathrm{oxide}\left(s\right)$

These metal oxides upon reaction with water form bases. Hence, metallic oxides are basic oxides.