Answer:
The answer is most like like D because most of the men were sent off to the war.
Explanation:
A P E X P L E A S E L I K E
Question 1 : C they looked for gold
question 2: B they were called the 49ers because it was the year 1849
Answer:To Prevent Bias which may arise from a major difference from personal characteristics.
Explanation: Sampling is a part of a population that is to be used for a research or experiment.
Variables are factors or members of a sample or Population that are can be altered (Dependent variables) in order to create an effect on another variables.
Independent variables are variables that are consistent and are not affected by other variables.
To Prevent BIAS,proper Sampling or inducing independent variables it must include all the factors necessary in an experiment or research.
The correct answer to your question is the last one. This because the thing these amendments have in common is about the African American and giving them rights and freedom. Hope this helps you :)