An observation of how elements in nature will behave under certain conditions is hypothesis. Thus the option D is correct.
What is scientific hypothesis ?
It is an observation base educated guess and a prediction of cause and effect.
A hypothesis can be supported by either experimental data and existing observational data.
The hypothesis should be clear and precise, relational, specific, conduction of more number of tests should be feasible, simply explained, well understood.
The different sources of hypothesis are similarity between the phenomenon, past evidence, scientific theories etc.
Different types of hypothesis include Simple, complex, directional, non-directional, null hypothesis etc.
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