Final answer:
Ms. Ironstone's medication will be administered through inhalation in the form of a puff.
Step-by-step explanation:
The sig on Ms. Ironstone's prescription reads "Inh 1 puff po bid prn asthma."
The abbreviation "Inh" in the sig stands for inhalation, indicating that the medication will be administered through inhalation.
Therefore, the answer is option c) Inhalation. Ms. Ironstone will inhale the medication in the form of a puff to treat her asthma.