Answer:
C. measurements and observations
Explanation:
Measurement is a basic science process that allows us to compare a selected unit of measurement with the object or phenomenon whose physical magnitude is to be measured, to determine times the unit is contained in that magnitude.
On the other hand, observation is the technique where information is collected, which consists of observing, accumulating and interpreting the actions, behaviors and facts of people or objects, as they are usually carried out.
Both methods provide real and significant data on the event to be studied. Instead inferences are conclusions that are derived from premises and opinions are judgments that are formed on something questionable.
