Of the Following Solutions, Which Has the Greatest Buffering Capacity

Multiple Choice

Of the following solutions, which has the greatest buffering capacity?

A) 0.821 M HF and 0.217 M NaF
B) 0.821 M HF and 0.909 M NaF
C) 0.100 M HF and 0.217 M NaF
D) 0.121 M HF and 0.667 M NaF
E) They are all buffer solutions and would all have the same capacity.