Kf (aq) + hbr (aq) --> kbr (aq) +hf (aq)

write the net ionic equation. include states and charges.

There is no net ionic equation because no precipitation occur.

Explanation:

Chemical reaction:

KF(aq) + HBr(aq) → KBr(aq) + HF(aq)

Ionic equation:

K⁺(aq)  + F⁻(aq)  + H⁺(aq)  + Br⁻(aq)    →  K⁺(aq)  + Br⁻(aq)  + H⁺(aq)  + F⁻(aq)

It can be seen all ions are in aqueous form, so all are spectator ions and there will be no net ionic equation because all are cancel each other.

In this reaction no precipitation occur that's why net ionic equation can not be written.

the answer to your question is c

i think it's letter a.