During research in the 1940s and 1950s, no variations in personalities were found across the cultures t or f

False

Explanation:

It is false that during these years no variation in personalities were found across cultures. In fact, during these years, researchers realized that an individual's personality varies significantly based on their cultural background. While this does not absolutely determine a person's character, it does represent an important influence.

i think it is true in my reasonment ..

hello there the answer is d