By definition, the correct answer is option d) This is an example of velocity.
Definition of velocity
Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction.
Because the speed also considers the direction in which the displacement of an object occurs, it is considered a vector magnitude.
So, the velocity can be defined as the amount of space traveled per unit of time with which a body moves, considering the direction, and can be calculated using the expression:
[tex]velocity=\frac{distance traveled}{time}[/tex]
Velocity has units of [tex]\frac{distance}{time}[/tex], such as [tex]\frac{meters}{second}[/tex] or [tex]\frac{miles}{hour}[/tex], and includes direction of travel.
Summary
Mary travelled 70 miles/hour due north. So, in this case, the correct answer is option d) This is an example of velocity.
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