Concept:When an s-block metal reacts with a p-block non-metal, the bond is usually ionic because electrons are transferred.
Explanation:s-block elements are metals with low electronegativity.
They tend to lose one or two electrons easily to form positive ions, or cations.
p-block non-metals, such as halogens and oxygen, have high electronegativity.
They readily gain electrons to form negative ions, or anions.
The strong electrostatic force of attraction between these oppositely charged ions creates an ionic bond.
This type of bond is also called an electrovalent bond.
Answer:A. electrovalent