Examine each of the choices and make sure they satisfy the two conditions for an unbiased sample.

Eliminate \(\mathrm{A}\) and \(\mathrm{B}\) because they do not give every member of the population an equal chance of being chosen. (Only students in English or in the first hundred on the list have a chance.)

Eliminate D because not all students will mail their preference. (They may not be able to afford the postage, for example.)

The correct answer is \(C\) It selects persons from the target population (students) and it gives every student an equal chance of being chosen.