Final answer:
The correct answer is true. A theory is a well-supported explanation for patterns in nature that attempts to explain the relationships between variables in a model, but it should only provide an explanation for the most important relationships theorized to exist among the variables.
Step-by-step explanation:
The correct answer is a. true.
A theory is a well-supported explanation for patterns in nature that is based on scientific evidence and has been verified multiple times by multiple researchers. It attempts to explain the relationships between variables in a model. However, an explanation should only be provided for the most important relationships theorized to exist among the variables. This ensures that the theory is focused and concise.