From the list of internal invalidity issues in Babbie, what are the three that are potentially the most critical

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From the list of internal invalidity issues in Babbie, what are the three that are potentially the most critical for addressing in the experiment?

Sources of internal invalidity in experiments
The eight sources of internal invalidity are: history, maturation, testing, instrumentation, statistical regression, selection bias, experimental mortality, and demoralization. It’s important that researchers are aware of the eight sources of internal invalidity that can affect their experimental results
What are the 3 types of internal validity?
Content validity examines whether the test truly supports what it wants to test. This refers to the testing method to be used. Content validity checks if it is the most appropriate method for the study. Face validity explains whether the content or data of the study can truly represent the aims of the test.
What are 3 factors to consider when assessing the external validity of a study?
These factors include age, gender, educational levels, risk factor, life style, and environment. These factors often have impact on health status and so should be controlled. Attrition bias is a type of selection bias.