Why do carpenters use a screw instead of nails to join two pieces of wood?

Screws have phenomenal tensile strength which is far greater than nails. Screws build a tight adhesion between two pieces of wood.  

Nails are used for joints, because even after multiple twists the wood at the joints will remain together when nails are used. But a screw will come off after a single twist, if screws are used to hold wood at the joints.  

For any static wood work screws are better than nails because of their tensile strength.  

elements make up everything, and they combine to make compounds.

the answer is c

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