What causes atoms to form covalent bonds? in a covalent bond, two atoms are held together by the attraction the number of covalent bonds that an atom can form depends on the number in the atom.

Cation and anion cause covalent bonds

:- At cation positive charge are held and at anion negative. .. there is a strong bond between them.

Since a covalent bond is formed by sharing electron pairs, the attraction is between positive nuclei and the shared electron pairs. The number of bonds depends on the number of valence electrons of the atom.

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.