Subjective observations are based on personal beliefs or interpretations rather than empirical evidence. An assumption is a key example of a subjective observation, contrasting with objective observations that can be tested or measured. Therefore, the correct answer is the option referring to an assumption. ;
An assumption is the best example of a subjective observation, as it reflects personal beliefs rather than measurable facts. Other options like tests and facts represent objective observations. Therefore, the correct answer is A. An assumption.
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