Answer:
The correct answer is: a. Public compliance; private acceptance.
Step-by-step explanation:
Public compliance can be understood as the social phenomena that occur when a group of people superficially agree on a particular thing, usually to get social approval.
Private acceptance can be understood as a more personal change in attitude that individuals experience when they are fundamentally convinced of something they may have not seen before, but do not express it loudly and socially.
In this particular case, when the participants of the standard experiments were able to write their responses on a piece of paper, conformity dropped dramatically. This means that during the experiments the level of public compliace were high while the levels of private acceptance were low.
In conclusion, the correct answer is a. Public compliance; private acceptance.