HA Is an Acid with a PK_a=4

HA is an acid with a pK_a=4.5 hich of the following statements about an aqueous solution of HA is true?

A) At pH=4.5 , the solution contains more H-A than A-
B) At pH=4.5 , the solution contains more A- than H-A.
C) At pH=3.5 , the solution contains more A- and HA.
D) At pH=6.5 , the solution contains much more HA than A-.
E) At pH=4.5 , the solution contains about the same amount of A- and HA.