To Ensure a Controlled Experiment,all of the Following Conditions (Variables)should

Multiple Choice

To ensure a controlled experiment,all of the following conditions (variables) should be identical in Group 1 and Group 2:

A) type of bacteria,temperature,and incubation period
B) temperature and amount of initial inoculum (bacteria used)
C) type of bacteria,incubation period,amount of bacteria used
D) degree of turbidity,incubation period,and amount of bacteria