Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The question asks for the verb form associated with the noun "height." Among the given options, "heighten" (A) is the only choice that directly derives from "height" and functions as a verb. To "heighten" means to increase or make something greater in terms of intensity, elevation, or significance. It embodies the concept of raising something to a greater level, which aligns closely with the meaning of "height."

In contrast, the other options do not relate to "height" in a verb form. "Higher" (B) is an adjective that describes something as being greater in height but does not function as a verb. "Heist" (C) is a noun that refers to a robbery and has no semantic connection to "height." Lastly, "heifer" (D) refers to a young female cow and is unrelated to the concept of height. Therefore, "heighten" is the most appropriate answer as it is the verb form that corresponds directly with the noun "height." This relationship makes it clear why option A is the correct choice.