A buffer solution

Question

A. contains approximately equal amounts of a weak acid and its conjugate base.
B. increases its properties with an increase in the concentrations of the two buffer components.
C. resists changes in pH.
D. all of the above
This one is D right

Answer 1

I agree D is right but ONLY if you tell me what "approximately" in A means. Both B and C are correct. If this question has only ONE answer, then A must be true which makes D true. But I see buffer solutions on this board all the time with (Base) = 0.2(Acid) which makes the ratio about 5:1. That doesn't sound like approximately equal to me.