Correct Answer:
B. 12-16
The correct answer is 12-16. The normal resting respiration rate for an adult human is 12 to 16 breaths per minute. This rate can vary based on age, health, and physical activity. For children, the rate is typically higher (20–30 breaths per minute), while for adults, the normal range is between 12 and 20 breaths per minute, with 12–16 being the most commonly cited resting rate. Options like 10–14, 16–20, and 14–18 are outside the standard adult resting range. Therefore, 12–16 is the correct answer.