The average age in a sample of 190 students at City College is 22. As a result of this sample, it can be concluded that the average age of all the students at City College（ ）.

A、must be more than 22, since the population is always larger than the sample;
B、must be less than 22, since the sample is only a part of the population;
C、could not be 22;
D、could be larger, smaller, or equal to 22