Final answer:
The High jumper is the athlete most likely to require more than 20° of ankle dorsiflexion for the powerful takeoff needed during the jump (option B).
Step-by-step explanation:
The athlete that would likely require more than 20° of ankle dorsiflexion is a High jumper. Ankle dorsiflexion is the movement where the top of the foot is brought closer to the shin, and high jumpers would need greater degrees of dorsiflexion during their performance. Specifically, when they approach the bar and prepare for their jump, they would dorsiflex the ankle to help generate the necessary force for a powerful takeoff. In contrast, the movements involved in long-distance running, cycling and swimming do not generally require such an extreme range of motion in the ankle
Hence, the answer is option B.