Discusses two ways in which cultural views can negatively affect relationships
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Explanation:

Miscommunication: language is necessary for communication and communication can cause a misunderstandings relationship particularly when people cannot speak or understand each other’s language.  The inability to speak a language that others could understand is known as "language barrier" and it is certainly one of the cultural differences that can affect a relationship.

Food: tastes can be different, what you consider as food may not be food in other cultures. The time you eat may be different from the other person’s with a different culture which could also one of the cultural differences that can affect a relationship.

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answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

the telephone is the answer