Question

mary travelled 70 miles/hour due north. this is an example of a acceleration b distance c speed d velocity

Explanation:

Speed is a scalar quantity that refers to "how fast an object is moving." Here, 70 miles/hour is a measure of how fast Mary is moving. It is not acceleration (rate of change of velocity), not distance (total path length), and not velocity (speed with direction - though it has direction here, the key is the measure of fast - moving which is speed conceptually).

Answer:

C. speed