Which of the following best describes the symptoms of anaphylaxis?

The symptoms of anaphylaxis are best characterized by a rapid onset of severe reactions affecting multiple body systems, predominantly including respiratory and cardiovascular issues. The key symptoms typically include difficulty breathing due to airway constriction, swelling of the face and throat (angioedema), and tachycardia, which is represented by a rapid heartbeat. This combination reflects the systemic nature of anaphylaxis, which can progress quickly and requires immediate medical intervention.

In contrast, the other options describe symptoms that do not align with the acute and life-threatening nature of anaphylaxis. Dizziness, fatigue, prolonged cough, and headache are more indicative of less severe conditions, while chest pain, nausea, and abdominal cramping may suggest other medical issues but are not central to the immediate dangers associated with anaphylaxis. Lastly, rash, skin irritation, and fever tend to point toward allergic reactions or infections rather than the critical systemic response characteristic of anaphylaxis. Thus, option B accurately captures the urgent and multi-systemic nature of anaphylactic reactions.