Answer :
We know that K (Potassium) forms a 1+ ion.
We also know that Br (Bromine) forms a 1- ion.
therefore D. KBr is correct
We also know that Br (Bromine) forms a 1- ion.
therefore D. KBr is correct
the right answer is D) KBr because potassium has vallence 1 and the same too with brom and vallence one it's not written