Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The correct adjective form of the noun "contribution" is "contributory." This term is often used to describe something that contributes to a result or outcome. In legal, financial, and academic contexts, "contributory" indicates a role that one factor plays in a larger process or system. For example, a "contributory cause" refers to a factor that contributes to a particular event or situation.

Option A, "contributative," is not commonly accepted in standard English usage. While option C, "contributional," might suggest having qualities related to contributions, it is not widely recognized as a formal adjective. Option D, "contribute," is a verb and does not serve as an adjective. Therefore, "contributory" is the most appropriate adjective that directly relates to "contribution," emphasizing the act of contributing or the quality of having a beneficial impact on something. It captures the essence of involvement and support that "contribution" implies, making it the clear choice in this context.