class discussion. previous knowledge. temperature changes. student observations.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student pours a clear liquid from a test tube into a beaker with a clear liquid already in it and notices that the mixture turns pink. The student infers the two clear liquids are different. This inference is a result of
Possibilities:
- class discussion.
- previous knowledge.
- temperature changes.
- student observations.

student observations.