A paper company wants to build a paper mill in the watershed where a village exists. To minimize potential pollution to the village, which of the following locations is the best place to build the mill?

It is d, all the other ones say incorrect answer .

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

The answer is: 6.3mi got it right

Ray 2 should cross through the focal point on the right side of the lens