Answer:
C.) K₂O
Step-by-step explanation:
Potassium (K) always forms the cation K⁺.
Oxygen (O) always forms the anion O²⁻.
The ionic compound these two ions form must have an overall charge of 0. However, the dissimilar charges on the ions do not cancel out (+1 + (-2) = -1). Therefore, you need to have two K⁺ ions in the compound to balance the charges (+1 +1 + (-2) = 0).