Which of the Following Cannot Generate a Poisson Distribution

Short Answer

Which of the following cannot generate a Poisson distribution? $\begin{array}{|l|l|}\hline A&\text {The number of children watching a movie. }\\\hline B&\text {The number of telephone calls received by a switchboard in a specified time period. }\\\hline C&\text { The number of customers arriving at a petrol station on Christmas day.}\\\hline D&\text {The number of bacteria found in a cubic yard of soil. }\\\hline \end{array}$