Final answer:
In the equation given, 't' stands for time, which is the duration of motion that affects both the initial velocity and the acceleration leading to a change in displacement.
Step-by-step explanation:
In the equation ΔS = Vo × t + (1/2) a × t², the variable 't' represents time. The symbols in the equation stand for displacement (ΔS), initial velocity (Vo), time (t), and acceleration (a). Since 't' is multiplied by the initial velocity and then by the acceleration factor in separate terms of the equation, it is clear that 't' signifies the time during which the motion takes place. In this context, time is the period over which the initial velocity acts and acceleration is applied to produce a change in displacement. The answer to the question is therefore C) Time.