Answer
(b) and (c) are true.
Work Step by Step
(a) For a pure acid solution, $[A^-] = [H_3O^+]$*, so this statement is false.
(b) -log(1.0) = 0 : True.
(c) In a strong acid solution: $[HA]_{initial} = [H_3O^+]$, so this is true.
(d) After putting a strong acid in water, it completely dissociates, so there is no $[HA]$.
