In Bandura, Ross and Ross' Study Aggressive Behaviour Was Measured

In Bandura, Ross and Ross' study aggressive behaviour was measured by observation through a one-way mirror, where (mainly) the male model recorded the child's behaviour every 5 seconds for 20 minutes. Which of the following is not a disadvantage of observing in this way?

A) In some cases, the male model would have known which condition the child was in and this may have affected how he recorded their behaviour
B) It is unethical because children do not know they are being observed
C) It is very difficult to write down a behaviour every 5 seconds
D) It is very difficult to code a behaviour accurately so quickly
E) Children behave just as they want to as they do not know they are being observed