Man does not live by ...... alone.

The phrase "Man does not live by ...... alone" is an idiomatic expression that implies that life requires more than just a single thing. The most common and traditional completion of this phrase is:

"Man does not live by bread alone."

This expression emphasizes that life's necessities go beyond physical sustenance and food. It implies that people also need intellectual, emotional, and spiritual fulfillment in addition to basic sustenance.

Therefore, the correct answer is:

Option B: bread