Answer :
In the context of the statement provided, the best answer to complete the sentence would be "OT," which stands for "Other Times." This completion would make the sentence read as: "Overcoming the fundamental attribution error requires making an effort to shift an external attribution into an internal attribution Other Times."
This completion makes sense in the context of the sentence as it suggests that in order to overcome the fundamental attribution error (the tendency to attribute others' behavior to internal factors rather than external circumstances), one needs to consider external factors or circumstances that may have influenced the behavior being observed.
By choosing "OT" as the completion, the sentence conveys the idea that shifting from external attributions to internal attributions is not always necessary, and that sometimes attributing behavior to external factors is important for understanding the full picture.
Therefore, "OT" is the best answer choice based on the context provided in the question.