Solution A has 150 mmol/L of sodium, 4 mmol/L of potassium, and 110 mmol/L of chloride. Solution B has 150 mmol/L of sodium, 4 mmol/L of potassium, 110 mmol/L of chloride, and 36 mmol/L of urea. All the following are true regarding these two solutions except?

A. They are isotonic
B. RBCs that have the same solutes as solution A would not change volume if placed in solution B
C. Salution A is hyperosmolar
D. Solution B is hyperosmolar