Correct — the answer is A
In the classic inversion-plantarflexion mechanism the anterior talofibular ligament fails first and is torn in roughly 90% of lateral sprains. The calcaneofibular ligament is added only in more severe injuries, and the posterior talofibular ligament rarely tears. The deltoid and syndesmotic ligaments involve different mechanisms.
Source: CAQ Sports Medicine — Ankle-Foot / Lateral Ankle Sprain