Answer:
D. A translation to the right by 20 units and down by 20 units
Explanation:
You want to know the effect of adding (20, -20) to the (x, y) coordinates of the vertices of a triangle.
Transformation
The x-coordinate of a point tells you its position to the right of the y-axis. Adding 20 to the x-coordinate moves its position 20 units farther to the right.
The y-coordinate of a point tells you its position above the x-axis. Subtracting 20 from the y-coordinate moves its position down 20 units.
The matrix represents the transformation ...
A translation to the right by 20 units and down by 20 units, choice D.
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