Which one of the following should be shown in an ionic equation as a MOLECULE or a COMPLETE FORMULA rather

Which one of the following should be shown in an ionic equation as a MOLECULE or a COMPLETE FORMULA rather than as separate ions?
a. Fe(NO3)3
b. NaOH
c. K2Cr2O7
d. CH3COOH
e. HNO3
f. Ba(OH)2
g. No other answer is correct; all substances are written as ions in an ionic equation.
h. NH4Cl
i. MgCl2

I tried Ba(OH)2 and -no other answer is correct; all substances are written as ions in an ionic equation.

Both were wrong =(

CH3COOH is the correct answer because the carboxy group is covalently bonded to the methane. All of the other substances are ionically bonded.

I would say d. CH3COOH, because that wouldn't split. If that's what you're asking for?

D. CH3COOH