Explanation

The question asks for the verb form of the noun "ability." To understand why "enable" is the correct answer, it helps to clarify the relationship between the words.

"Ability" is a noun that refers to the capacity or power to do something. It denotes a certain skill or competence. In contrast, the verb "enable" means to make someone or something able to do something, effectively granting the necessary skills or conditions for action. Thus, "enable" is directly derived from the concept of ability, as it involves facilitating or providing the means to perform an action.

Looking at the other options:
- "A) ableness" is a rare noun form that is less commonly used.
- "C) ably" is an adverb that describes how an action is performed, but it does not serve as a verb.
- "D) able" is an adjective that describes a state of having the ability but does not represent an action.

Therefore, "enable" stands out as the verb form related to "ability," as it encapsulates the action of empowering someone or something to possess that ability.