Final answer:
The attribute of a good hypothesis is that it should be clear and specific, as this allows for scientific testing and validation.
Step-by-step explanation:
An attribute of a good hypothesis is that it should be clear and specific. This means a useful hypothesis should be testable and falsifiable, allowing for a proposed explanation to be evaluated through scientific experiments. It should be based on scientific knowledge while also being logical, simple, and subject to disconfirmation based on experimental evidence.
A hypothesis that is vague or general does not provide enough detail for testing, one that yields only a single outcome ignores alternative possibilities, and a truism does not allow for scientific scrutiny. Thus, option 3: 'It should be clear and specific' is the correct attribute of a good hypothesis.