sharing of electrons between two atoms takes place
electrons are shared by one atom only
electrons are donated by one atom and shared by both atoms.
The correct option is B sharing of electrons between two atoms takes place
Covalent bonds are formed when two atoms begin sharing electrons, the electrons are attracted towards the nuclei that are positively charged. Example: $$Cl-Cl$$.
It is not necessary that both atoms of covalent bond always will be the same, they can be different for example $$HF$$ molecule, in such case electrons not shared equally and attract towards the more electronegative element.