Answer:
This question is incomplete. Here are the missing options:
- a) covariance
- b) statistical significance
- c) temporal precedence
- d) internal validity
The answer is c) temporal precedence.
Step-by-step explanation:
Temporal precedence is considered as one of the most important factors for determining research validity. In a cause-effect relationship, this term refers to establishing that the cause really did occur before the effect.
It is sometimes difficult to determine the temporal precedence of some factors, especially when they seem to occur simultaneously.