Which pH suits the question?

Question

Choose from the following for questions 1-3:
A. a solution with a pH = 7
B. a solution with a pH < 7, which is not a buffer
C. a solution with a pH < 7, which is a buffer
D. a solution with a pH > 7, which is not a buffer
E. a solution with a pH > 7, which is a buffer

Ionization Constants:
HCOOH Ka = 0.00018
CH3NH2 Ka = 0.00044
H3PO2 Ka1 = 0.03 Ka2 = 0.00000017

Questions:
1. A solution with an initial HCOOH concentration of 1 M, and an initial K2HPO2 concentration of 1 M.
2. A solution with an initial H3PO2 concentration of 1 M, and an initial KH2PO2 concentration of 1 M.
3. A solution with an initial CH3NH2 concentration of 1 M, and an initial CH3NH3Cl concentration of 1 M.


(I think 2 is C and 3 is E, but I'm not sure)

Answer 1

You're right about 2 and 3, and 1 is B.