Which of the following describes the angle of rotation of a counterclockwise rotation? . a. negative. b. positive. c. equal to 90 degrees. d. double the interior angle of the image.

Using the common assumption for angles of rotation, it is common to assume that any rotation counterclockwise is a positive. Therefore, the answer is "B. Positive". Although it can also be "C. equal to 90 degrees", the rotation can also be less than or greater than 90 degrees. So B is the closest answer.