Question

In the compound KHSO4, there is an ionic bond between the(1) KH+ and SO42- ions(2) KHSO3+ and O2- ions(3) K+ and HS- ions
(4) K+ and HSO4- ions

Answer 1

The answer is (4) K+ and HSO4- ions, because the two radical ions bond to create KHSO4. 

It also makes sense chemically speaking, because KH+ and SO4^2- cannot create a non-charged molecule, and naturally speaking all compounds that are not ions want to balance out their charges.

Answer 2

In an ionic compound, we have a reaction between a negative and a positive atom. 

Therefore, we automatically can conclude that our answer is (4) K+ and HSO4- ions
Hope I helped. :)