Scientific knowledge a. can change as new research and experiments are done. b. changes as the public's opinion of a given topic changes. c. is always accurate because scientists know everything about the natural world. d. never changes because scientists are never wrong.

The answer for this is a

It is a product

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.