which statement is an example of an observation a scientist would make to classify a rock?\na rock is larger…

Brief Explanations:

An observation is a factual description of what is seen, heard, etc. without interpretation. "A rock was found in a stream" is a simple, factual observation. "A rock is larger than other rocks" is a comparison, "A rock is formed from molten lava" is a statement about its origin (interpretation), and "A rock cracks in half after a reaction" implies a cause - effect relationship which is more than just a simple observation.

Answer:

B. A rock was found in a stream.