The principle of hometown USA middle school wants to find out if students would be in favor of starting girls and boys sports programs in the school. To do this he used to a computer software random name generator which had all students names download and the database he sampled the 100 names the computer had randomly picks and discovered that 78% of students were in favor. A. That is not valid sample since the principal only allowed students to volunteer for the survey if they had strong opinions.

B. This is not valid sample since the principal to students that were easy to reach.

C. This is a valid sample since the principal selected names randomly .

D. This is a valid sample since the principal used convenience sampling.