Where is thermal equilibrium achieved between two objects

I believe the correct answer from the choices listed above is option C. Thermal equilibrium is achieved between two objects when both objects have the same temperature. This is the condition under which two substances in physical contact with each other exchange no heat energy. Hope this answers the question.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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