The correct option is C R
Here, the small square grids are of area 1 sq. unit.
Let's count the number of unit squares included in each diagram.
In figure P, the number of unit squares = 6
In figure Q, the number of unit squares = 6
In figure R, the number of unit squares = 5
In figure S, the number of unit squares = 6
Therefore, figure R has an area of 5 sq. units.