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The correct answer is: A. Null and question form terms.

A hypothesis is a statement about the relationship between two or more variables. It is a tentative explanation for a phenomenon that can be tested by research. Hypotheses can be stated in a variety of ways, but they should always be clear, concise, and specific.

Null and question form terms are not appropriate for stating hypotheses because they are not specific enough. A null hypothesis is a statement that there is no relationship between two variables. A question form hypothesis is a statement that asks whether there is a relationship between two variables. Both of these types of hypotheses are too broad and could be interpreted in many different ways.

A better way to state a hypothesis is to use directional terms. Directional terms indicate the expected direction of the relationship between two variables. For example, a hypothesis might state that “there is a positive relationship between the number of hours a student studies and their GPA.” This hypothesis is specific and directional, which makes it easier