Final answer:
NH₃ (choice B) is most likely to be a covalently bonded, polar compound.
Step-by-step explanation:
The most likely compound to be covalently bonded and polar out of the options given is NH₃ (choice B).
A polar covalent bond occurs when there is an unequal sharing of electrons between atoms due to differences in electronegativity. In NH₃, nitrogen has a higher electronegativity than hydrogen, resulting in a partial negative charge on nitrogen and partial positive charges on the hydrogen atoms. This gives the molecule a net dipole moment and makes it polar.