Answer:
A) one calcium atom with an oxygen atom
Explanation:
An ionic compound is formed as result of electrovalent bonding between two atoms.
In this bond type, a more electronegative atom combines with a less electronegative one. It is usually between metals and non-metals. In ionic bonds, there is transfer of electrons between two atoms.
Calcium is a metal and oxygen is a non-metal. Calcium will readily lose its valence electron to achieve its desired octet configuration. Oxygen will gain the two electrons and have a configuration similar to that of Argon.
