Final answer:
When a triangle is rotated 90 degrees counterclockwise about its center point, it rotates A) clockwise.
Step-by-step explanation:
When a triangle is rotated 90 degrees counterclockwise (anti-clockwise) about its center point, it rotates clockwise. This means that the triangle moves in the direction opposite to the rotation.
To visualize this, imagine placing a pen on the center of the triangle and rotating the pen counterclockwise - the triangle will move in the opposite direction, which is clockwise.