The correct answer would be option 1, Correlation.
Correlation research strategy would allow you to determine whether students' college grades accurately predict later income.
Explanation:
In a research methodology, there are many methods that are used to reach to the conclusion like experimentation, observation, correlation, etc. When there is a situation in which the impact of one variable is to be analyzed on the basis of the other variable, then the Correlation methodology is used.
For example when it is to be analyzed that what is the impact of grades of college students on the income they will earn, then these two variables will be used in the correlation method to find out the relation between them.
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