Answer:
C)
Explanation:
the rule: if slope1*slope2= -1, then the two given lines are perpendicular.
1) the slope of the line A is -3; B is 3; C is 3; D is 1/3, then
2) according to the rule A and B not perpendicular; B and C not perpendicular; A and D are perpendicular; C and D not perpendicular.