Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The question "What is the verb of 'light'?" can be somewhat confusing due to the different meanings associated with "light." The term "light" can function as both a noun and a verb. As a verb, "light" means to illuminate or make something brighter (e.g., to light a candle). However, in the options provided, the focus appears to be on a related concept of providing understanding or insight.

Among the choices, "enlighten" stands out as the best option. The verb "enlighten" refers to the act of giving someone greater knowledge and understanding about a subject or situation. It derives from the root word "light," symbolically referring to shedding light on a topic to dispel ignorance.

While "light" and "lightened" are also forms of the verb that deal with illumination or reducing weight, they do not capture the broader intellectual concept implied in "enlighten." "Enlight" is less commonly used and not the standard form of the verb. Therefore, "enlighten" is the most appropriate answer, as it encompasses the idea of enlightening one's understanding and knowledge, reflecting the dynamic relationship between "light" and awareness.