The following items measure the extent to which americans are willing to associate with extraterrestrials. 1. it's ok if my child marries an extraterrestrial. 2. it's ok to have an extraterrestrial for a friend. 3. it's ok to have an extraterrestrial living on the block. 4. it's ok to have an extraterrestrial living in my state. these items illustrate a:

Bogardus Social Distance Scale

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question these items illustrate the Bogardus Social Distance Scale. This is a psychological scale that empirically measure people's willingness to participate in social contacts of varying degrees of closeness with members of diverse social groups. Which in this situation seems to be Aliens.

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corrupt also means cruel

b) to encourage free trade