Please Read the Clinical Scenario, and Then Answer the Question

Multiple Choice

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
Mark is a 9-year-old Hispanic boy who has come into your emergency room complaining of “chest tightness” and “difficulty breathing.” You notice that he is frequently coughing, and his lungs sound very wheezy. His chest X ray shows lungs that are overexpanded. His mom said that he had five episodes like this one over the past few years, but none this bad. Recently, he’s had 5 episodes over the previous month, each lasting about a day.
-Which of the following allergic mediators are being currently activated in Mark's system?

A) mast cells
B) leukotrienes
C) serotonin
D) All of the choices are correct.