Topic: Root, Prefix, Suffix, Affix, Infix, Morpheme & Derivatives,

Best Answer Explained in Below-:

The word "imagine" serves as a base form from which various derivatives can be formed. In the context of the options provided, "imaginary" is the most directly related derivative. To understand why, we can break down the words.

"Imaginary" is an adjective derived from the base verb "imagine," describing something that exists only in thought or imagination, rather than in reality. For example, we might refer to "imaginary friends" or "imaginary numbers" in mathematics. This derivative retains the core meaning associated with imagination while expanding it into a specific contextual application.

On the other hand, the other options do not relate directly to the derived meaning of "imagine." "Inimagine" does not exist in standard English usage, "imaginatory" is less common and may not have a clear usage context, and "imagify" suggests a radical transformation into something imaginary, which is not a standard derivative of "imagine."

In conclusion, "imaginary" aptly captures the essence of the noun "imagination" and fits seamlessly within the broader family of words related to the concept of imagining. Thus, it is the correct derivative choice from the options given.