Which is the strongest bond, ionic or covalent

An ionic bond  

Explanation:

There is some overlap, but an ionic bond is usually stronger.

The lattice energies of ionic substances have a range of 700 kJ·mol⁻¹ to 11000 kJ·mol⁻¹.

Covalent bond dissociation energies range from 150 kJ·mol⁻¹ to 1100 kJ·mol⁻¹.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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