What is the most commonly injured ligament in an acute inversion ankle sprain?
AAnterior talofibular ligament (ATFL)
BCalcaneofibular ligament (CFL)
CPosterior talofibular ligament (PTFL)
DDeltoid ligament
Explanation: The ATFL is the weakest of the lateral ankle collateral ligaments and is almost always the first structure to tear in a supination/inversion injury.