In Q2, choice b does not relate to what we say "heteroskedasticity", which describes some internal relation ships between independent, not dependent, variables and the error terms. As a result, choice b is not a that kind of modeling problem. That is my opinion.
In Q28,maybe you have to compare the R of the 4 countries and determine which one is tended to be negative, most often the country which has the lowest R,then that will be the best answer.
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