题目内容：
Which of the following statements are false?
(i) If a sample is selected using random sampling, it will be free from bias.
(ii) A sampling frame is a numbered list of all items in a sample.
(iii) In cluster sampling there is very little potential for bias.
(iv) In quota sampling, investigators are told to interview all the people they meet up to a certain quota.
A(i), (ii), (iii) and (iv)
B(i), (ii) and (iii)
C(ii) and (iii)
D(ii) only
答案解析：