Answer:
Option (6)
Step-by-step explanation:
Coordinates of the vertices are,
A(1, 1), B(1, 4) and C(3, 1)
Rule for the rotation of a point by 90° counterclockwise about the origin is,
(x, y) → (-y, x)
Therefore, after the transformation the new vertices of the triangle will be,
A(1, 1) → A'(-1, 1)
B(1, 4) → B'(-4, 1)
C(3, 1) → C'(-1, 3)
Therefore, after rotation coordinates of point C will be,
C'(-1, 3)
Option (6) will be the correct option.