Answer:
The correct option is;
C. Systemic Random Sample
Explanation:
From the question, whereby each 10th person entering the mall is selected to answer the statistic the question which is in essence ensuring that the population is ordered by filing into the mall, therefore, the kind of sampling is systemic sampling.
In systemic sampling the population is arranged in an order and from there a member is selected as the population is accessed as the start of the sample and every nth member after that is then selected to be part of the sample.