When a body is thrown vertically upwards from bottom of the building, its potential energy changes with height as
(take the bottom of the building as reference point)

The correct option is A
The body is initially at a certain height from the reference point. So initial potential energy is a positive value.
As the height increases, work done by gravity becomes more negative.
So, Potential energy $=(-\text{Work done)}=mgh$
$\Rightarrow$ Potential Energy increases linearly with height.