Which is the most direct way to collect evidence in a scientific investigation?

Correct answer: Making observations and measurements

The direct answer is option C: making observations and measurements is the most direct way to collect evidence. Scientific evidence is information obtained carefully from the real investigation. A researcher may observe colour, movement, or change, and may measure mass, length, time, or temperature using suitable instruments. The reasoning is: perform the investigation; observe what happens; measure relevant quantities; record the results; use those records as evidence. Option A is wrong because a story may contain information but is not direct evidence from this investigation. Option B is wrong because a rumour is unverified information and may be false. Option C is correct because observation and measurement produce firsthand, checkable evidence. Option D is wrong because memorising an answer does not collect new evidence. Memory cue: science asks “What did we observe or measure?”