Benadryl syrup typically has a concentration of 2.5% diphenhydramine. which is approx 3%. Therefore, the correct answer is option C.
The concentration of Benadryl syrup can vary depending on the specific formulation.
However, a common concentration for Benadryl syrup is 12.5 mg of diphenhydramine per 5 mL of syrup.
This corresponds to a concentration of 2.5% (or 0.025) of diphenhydramine in the syrup.
It's important to note that the concentration can vary among different brands or formulations of Benadryl syrup, so it's always recommended to check the label or consult a healthcare professional for accurate information.