The experimental study must be done by scientists to assess causality questions.
An analysis that carefully follows a scientific investigation process is called experimental investigation. It consists of a thesis, a controllable variable, and variables that can be counted, computed, and reached.
Most crucially, controlled conditions are used to conduct experimental research. You use the first set as a reference point to calculate the differences between the second set. For instance, quantitative research techniques involve experimentation.
The objective of the experimental approach is to produce more conclusive results than can be obtained from correlational research regarding the causal links between the variables in a study hypothesis.
Therefore the correct answer is b. experimental research.
The complete question is:
To evaluate questions of causality, scientists must conduct
a. relational research.
b. experimental research.
c. laboratory research.
d. descriptive research.
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