Answer:
"Third statement" follows both positive and negative feedback.
Explanation:
Increased plant photosynthesis resulting from a temperature rise can remove carbon dioxide from the atmosphere which can potentially lead to a negative feedback. it is very common sense that remove of CO2 from atmosphere is not good for atmosphere.
Increased evaporation resulting from a temperature rise can produce more clouds which can potentially lead to a negative feedback. increased evaporation lead to more salinity of water that is not good for environment.
If ice cover melts due to a temperature rise the result will be decreased albedo or reflectivity which can potentially lead to a positive feedback. when their will be decreased albedo mean energy absorbing capacity increases, its good.
All the above 3 statement are true for positive or negative feedback.