A girl wanted to find out how the distance
between a light source and an object affects
the length of the shadow. She placed
the same metal stick at three different
positions P, Q and R as shown in the figure.
At these positions she recorded the length
(in cm) of the shadow cast on the wall as
xP, xQ and xR respectively.
Select the most appropriate reading from
the following options.
| XP | XQ | XR | |
| A | 15 | 20 | 25 |
| B | 25 | 20 | 15 |
| C | 15 | 25 | 20 |
| D | 25 | 15 | 20 |