Which set of polar coordinates describes the same location as the rectangular coordinates (1,-1) A. (-1, 135 degrees) B. (sqrt 2, 315 degrees) C. (1, 45 degrees) D. (sqrt 2, 225 degrees)

The answer to this question is B. (sqrt 2, 315 degrees). This polar coordinate is the only coordinate with its angle in quadrant 4 and a length of √1^2 + (-1)^2 = √2.