Answer
a). $(1)$ the volume will increase.
b). $10.6$%
Work Step by Step
a). The volume will increase. (1) is correct.
By ideal gas law, $V=\frac{NRT}{P}$
So if $p=p_{0}$, volume is proportional to temperature.
b). $V=\frac{NRT}{P}$
If temperature increases from $10^{\circ}C$ to $40^{\circ}C$,
$\Delta T=30$
Hence, $\Delta V=\frac{NR\Delta T}{P}=\frac{30NR}{P}$
Initial V = $\frac{283NR}{P}$
So, percentage change $=\frac{\Delta V}{V}=\frac{30}{283}=10.6$%