Which bond is formed due to a high electronegativity difference? covalent hydrogen metallic ionic

Ionic bond

Explanation:
When the electronegativity between the two atoms is very large (usually greater than 2.1), this can lead to total transfer of electron from the higher electronegative  atom to the lower one.
The total transfer of electrons leads to the formation of ionic bond.

Ithink its solid. hope this

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.