Parallel and perpendicular lines.

The answer is the last choice  

Explanation:

Well i think this because we have no info about line L so we cant make assumptions but we do know that M and P are perpendicular this means both lines are straight also p and n are parallel so also n is a straight line meaning that m and n are perpendicular making a perfect 90 degree angle    

answer; ///i believe the correct answer to the above question is; ///(drainage basin;