Tech A says that in modern vehicles, an oxygen sensor is only positioned in the exhaust pipe after the catalytic converter. Tech B says that the oxygen sensor provides the electronic body control module (EBCM) with an electrical signal that relates to the amount of oxygen in the exhaust gas. Who is correct

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. 

A). redi wish i´ve

Hellothe asnwer is b.have a nice day