Question

What substance has nonpolar covalent bonds?

Answer 1

Diamond, dihydrogen, carbon?

Explanation:

Any `"element-element"` bond is necessarily non-polar and covalent. I could choose molecular species, i.e. homonuclear diatomic molecules, i.e. `H_2` or `X_2` or `O_2` or `N_2`; or I could choose non-molecular species, for instance graphite or diamond.