We discover that social scientists in the 1960's predicted that religion would disappear along with the rapid development of (what she talked about in class)

We discover that social scientists in the 1960's predicted that religion would disappear along with the rapid development of science and secular attitudes within society

Explanation:

The 1960s were a period of transition. The generation who grew up after the war did not want to follow the steps of their parents, and the values shared by the previous generations now were on target of a young population that desires to create their point of view about the world and themselves. They begin to praise science as the answer to the problems and fight against the traditional values promoted by religion. This behavior, according to many social scientists, would create a different society more rational.

i think it is the third one.