People from widely different cultures display and interpret facial expressions of emotion in a similar manner. This best illustrates the impact of A. human genetic similarities. B. the adaptation-level phenomenon. C. the catharsis hypothesis. D. the spillover effect.

A. human genetic similarities.

Explanation:

Every basic physical features that humans can do without external learning are influenced by our genetic. Genetic similarities resulted in almost identical physical components that exist between humans regardless of our races.

When we examine people with different races, we will find that our physical mechanism are extremely similar with one another. Our bodily function are similar, the range of emotions that we feel are the same, Our tendency to make facial expressions in response to our emotions are also the same, etc.