Final Answer:
A solid hypothesis should meet all three criteria: It must be testable, clearly specify relationships between variables, and explain more facts than an alternative hypothesis. Therefore, the correct option is D - All of these choices are correct.
Therefore, correct option is D. All of these choices are correct.
Step-by-step explanation:
A testable hypothesis is essential for the scientific method as it allows for empirical verification. Clear specification of relationships between variables ensures precision and clarity in research design. Additionally, a solid hypothesis should explain more facts than alternative hypotheses, demonstrating its comprehensiveness and explanatory power.
Option D encompasses these crucial attributes, emphasizing the importance of a hypothesis being not only testable but also explicit in specifying relationships and offering a comprehensive explanation.
Crafting a robust hypothesis is foundational in research, guiding the study's design and contributing to the overall rigor and validity of scientific inquiry.
Therefore, correct option is D. All of these choices are correct.