Which hypothesis clearly states both cause and result?

Correct answer: If water temperature increases then salt will dissolve faster

A useful hypothesis makes a prediction that can be tested by an investigation. It normally connects a condition or cause with an expected effect, often in an “if...then...” form. The cause should be something that can be changed or compared, and the result should be observable or measurable. This makes the hypothesis more precise than a general opinion or description.

Option A is correct because it states both parts clearly: increasing water temperature is the proposed cause, and faster salt dissolving is the predicted result. A suitable experiment could compare the dissolving time at different temperatures while controlling other conditions. “Salt is white” is a description, while the other statements are vague and do not specify a measurable cause-and-effect relationship.