Final answer:
The term for the amount of air inhaled during a forced inspiration is Inspiratory reserve volume (IRV), which represents the lung capacity for additional air intake beyond normal breathing.
Step-by-step explanation:
The term for the amount of air inhaled during an active (forced) inspiration is b) Inspiratory reserve volume (IRV). Inspiratory reserve volume is the extra volume of air that can be inhaled into the lungs during a forced inspiration, beyond what is inhaled during normal breathing or tidal volume. This volume is significant as it demonstrates the lung capacity beyond the baseline after normal inhalation.