Under the concept of —— we can assume that a cause that a cause can be identified for every effect

causality

Explanation:

Under the concept of causality, we assume that there is an interdependence between cause and effect, where cause precedes effect in time order.

Cause and effect are seen as two variables, in constant correlation, hence being called a cause-effect relationship.

 A cause is a sort of an explanation, while the effect is the result. The connection between cause and effect can also be referred to as causal effect or causation.

the answer would be a i think?

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!