How Do Heat Shock Proteins Protect Plants from High Temperatures

How do heat shock proteins protect plants from high temperatures?

A) Heat shock proteins stabilize other proteins so that they don't denature at higher temperatures.
B) Heat shock proteins prevent carbohydrates from being hydrolized at higher temperatures.
C) Heat shock proteins prevent the double helix of DNA molecules from unwinding at higher temperatures.
D) Heat shock proteins prevent lipids from dissolving at higher temperatures.