You omitted the arrow.
CH3COOH ==> CH3COO^- + H^+
CH3COOH is an acid because it is donating a proton. The CH3COO^- is its conjugate base.
Your choice is right but I want to point out that CH3COO^- is its conjugate base. Technically, answer B is correct, also, although the word "base" is not there; it IS a conjugate.
For the reaction CH3COOH- CH3COO + H+, which of the following statements is true?
CH3COO- is an Arrhenius base.
CH3COO- is a conjugate
CH3COOH- is a Brønsted-Lowry acid. <my choice
CH3COOH- is a Brønsted-Lowry base.
2 answers
naturally a is correct