Which of the Following Is/are True About Maximum Contaminant Level

Which of the following is/are true about Maximum Contaminant Level Goals (MCLGs) ?
I.The MCLG for any contaminant that is regulated as a carcinogen is set to zero.
II.An average person weighing 70 kg (154 lb) could drink two liters (about two quarts) of water containing a contaminant at the MCGL level every day for 70 years without suffering any ill effects.
III.The Maximum Contaminant Level (MCL) set by the EPA may be higher than the MCLG to account for the financial and technical barriers that may make achieving these goals difficult.
IV.The MCLG for a contaminant is always set to zero because this is the best way to protect human health.

A) II only
B) I and II only
C) I,II,and III only
D) I,II,III,and IV