How does the duet rule apply to hydrogen in covalent bonding?

• A. Hydrogen shares two electrons to achieve a filled outer shell of 8 electrons.
• B. Hydrogen transfers two electrons to achieve a filled outer shell of 8 electrons.
• C. Hydrogen shares one electron to achieve a filled outer shell of 2 electrons.
• D. Hydrogen transfers one electron to achieve a filled outer shell of 2 electrons.

Answer: (C)