Answer:This threat to internal validity is called TESTING.
Explanation:
Testing refers a instant when a test is repeated with measures remaining constant as they were in the first test.
If participants are given the same test multiple times it is very likely that they may perform better only because they have mastered the test procedure and can now know how to respond better.
This will affect internal validity of the test because the result are no longer the real presentation of the outcome of the test.
Internal validity refers to how trustworthy an outcome is when looking at the cause and effect.
A. Because the Truman Doctrine was to prevent communism from spreading beyond where it existed. The policy worked for Greece and Turkey.
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Answer: c) Ethnic background.
Explanation:
Persuasive speech is used for helping the audience to understand , explain and educate about a certain topic so that they be aware and work in certain direction according to their point-of-view.
According to the question, while giving persuasive speech on immigration reform , the audience is being informed about improving legal migration and eliminating any sort of illegal migration. People's ethnic background should be considered as immigration involves country ,culture, religion etc and according to audience ethics speech should be given.
Other option are incorrect because gender , measurement , sexual position and education are not the part related with immigration reform .Thus, the correct option is option(c).
