Displacement is defined as the change in position from the starting point to the ending point. In the scenario described, Maria starts at her home, drives to the store, and then returns home.
Her displacement will be zero when her final position is the same as her initial position, which occurs at the beginning of her trip (0 hours) and when she returns home after her shopping (2 hours).
Therefore, the correct response is:
C. at 0 hours and 2 hours