A perpendicular force is applied to a certain area and produces a pressure P. If the same force is applied to a twice bigger area, the new pressure on the surface is :

We know that pressure is force per unit area
$\Rightarrow \mathrm{P}=\frac{\mathrm{F}}{\mathrm{A}}$

Given that for the former one, $\mathrm{P}=\frac{\mathrm{F}}{\mathrm{A}}$
For the later one, the area is doubled and force is kept constant. So the pressure will become half
Therefore the pressure for new system is $\frac{\mathrm{P}}{2}$
So the correct option is A