The Principle of Randomness in Sampling Means That

The principle of randomness in sampling means that

A) every person should have a known chance, and especially an equal chance, of being sampled.
B) there is no preplanning in the selection process.
C) every person in the target population who is encountered is selected.
D) researchers decide how many persons of certain types they need in the survey.
E) the poll is unscientific.