Which of the following cold war practices likely had the most significant psychological impact on citizens?

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be "mutually assured destruction," since this meant that if nuclear war broke out between the USSR and the US, unthinkable damage would be done to both nations. 

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.