Final answer:
Peripheral proteins, unlike integral proteins, are temporarily associated with the membrane and attached through non-covalent interactions, making them the easiest to remove by changing pH. The correct option is B-Protein attached/peripheral protein
Step-by-step explanation:
The type of protein that would be most easily removed from a membrane by changing the pH is the Protein attached/peripheral protein.
Peripheral proteins are not embedded within the lipid bilayer, instead, they are temporarily associated with the membrane, either connected to integral proteins or attached to the lipid heads through non-covalent interactions such as hydrogen bonds and ionic interactions.
Because peripheral proteins are often associated with the more hydrophilic parts of the membrane and held in place by electrostatic forces which can be disrupted by changes in pH, they can be easily removed when the pH is altered, unlike transmembrane or integral proteins which have hydrophobic interactions with the lipid core of the membrane. The correct option is B-Protein attached/peripheral protein