What is the nature of hydroxides and oxides of boron?

The correct option is A acidic

Boron oxides and hydroxides are acidic in nature.

When they react with water, they produce acids which gives $H^{+}$ ion. It can denote $H^{+}$ ion.

eg- $B_2{O}_3$ $+$ $3H_{2}O$ $⟶$ $2H_{3}B{O}_3$

Boric acid

$B(OH{)}_3$ $\stackrel{H_{2}O}{\rightleftharpoons }$ $HB{O}_2$

Oxoborinic

acid