The answer is B. (The first answer above me is incorrect)
I chose the answer that said "Transition to socialist and communist government systems, and creation of labor unions."
The correct option is A.
A basic solution has a high concentration of hydroxide ions more than any type of ion and that is why it is basic in nature. An acidic solution has a higher concentration of hydrogen ions and that is why it is acidic in nature. A neutral solution has equal amount of hydroxide and hydrogen ions. Solutions are usually classified as either basic or acidic based on their hydrogen ion concentration.
The parts of the plasma membrane is mentioned in the diagram below:
