According to general relativity, why does earth orbit the sun? a. earth and the sun are continually exchanging photons of light in a way that holds earth in orbit. b. earth interacts with the magnetic field of the sun. c. matter contains quarks, and earth and sun attract each other with the "color force" between their quarks. d. the mass tied to the sun warps the space around it, in a similar fashion to a large mass at the center of the trampoline.

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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.