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Signs of adequate breathing in the adult include all of the following, except:

  1. bilaterally clear breath sounds

  2. reduction in tidal volume

  3. respirations of 18 breaths/min

  4. rhythmic inhalation and exhalation

The correct answer is: bilaterally clear breath sounds

Adequate breathing in an adult is characterized by rhythmic inhalation and exhalation, bilaterally clear breath sounds, and a typical respiratory rate of 12-20 breaths per minute. Reduction in tidal volume is not a sign of adequate breathing; rather, it could indicate respiratory distress or inadequate ventilation. Therefore, option B is the correct answer.