Q is a point outside the line RS.
The distance between a point and a line, is defined as the shortest distance between a fixed point and any point on the line. It is the length of the line segment that is perpendicular to the line and passes through the point.
In the given figure among the lines drawn from point Q to line RS ,QT is perpendicular to RS and hence the distance between the point and the line.
Correct answer is option D.QT .
