For which titration can the end point not be determined accurately by using an acid-base indicator?

A.     ${\text{N}}{{\text{H}}_{\text{3}}}{\text{(aq)}} + {\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH(aq)}}$

B.     ${\text{NaOH(aq)}} + {\text{HN}}{{\text{O}}_{\text{3}}}{\text{(aq)}}$

C.     ${\text{N}}{{\text{H}}_{\text{3}}}{\text{(aq)}} + {\text{HN}}{{\text{O}}_{\text{3}}}{\text{(aq)}}$

D.     ${\text{NaOH(aq)}} + {\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH(aq)}}$

A