Which of the following is TRUE about block design?

I. The random assignment of units to treatments in a block design is accomplished in groups.
II. A type of block design is matched pairs.
III. The purpose of blocking is to increase variation in results.

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c