The misconception this question enforces is stronger than that. 1 and 3 attempt compare the the measurement of physical properties while number 4 is a behavioural observation that can only be measured through correlation. Numbers 1 and 3 can be proven to be fact through measurement while number can only be a hypothesis(that can only be proven with a causation or disproven with a observation that states otherwise). From the TFA the purpose of the question is asses the student's ability to discern opinion/interpretation from a scientific observation. While number is undoubtedly a scientific observation, asserting number 4 is true after observation is still an opinion/interpretation, making it a poor choice to assert that student has a clear understanding of the difference between opinion and fact.