Find the correct adverb form of the noun "Improvement".

1. Regular Adverb Formation: In English, many adverbs are formed by adding the suffix "-ly" to an adjective. However, "improvement" is a noun, not an adjective, so this rule doesn't apply directly.

2. Irregular Adverb Formation: Some adverbs are formed irregularly without the "-ly" suffix. In the case of "improvement," there isn't a common irregular adverb form.

3. Adverbial Phrases: Sometimes, adverbs are formed by using adverbial phrases, but there isn't a standard adverbial phrase derived from "improvement."

Given these rules, we have to consider the specific context and meaning of "improvement." "Improvement" is a noun referring to the action or process of improving something. However, "improvably" (option গ) is not a standard adverb form in English.

It seems there might have been a misunderstanding in the options provided. If we're looking for the correct adverb form of "improvement," it would typically be formed by using an adverbial phrase or by rephrasing the sentence to convey the intended meaning. For example, "in an improving manner" or "in a way that shows improvement."