The correct answer is A. very many people.
The phrase “very much” is an adverb that can be used to modify adjectives, verbs, and other adverbs. In this case, it is modifying the noun “people.” However, “very much” is not the most idiomatic way to express this idea. The more common way to say this would be “very many people.”
The phrase “very more” is not grammatically correct. The word “more” is an adverb that can be used to modify adjectives and adverbs. However, it cannot be used to modify nouns.
The phrase “very such people” is also not grammatically correct. The word “such” is an adjective that can be used to modify nouns. However, it cannot be used to modify adverbs.
The phrase “No improvement” is incorrect because the original sentence is grammatically incorrect. The correct sentence should be “Evidently very many people are involved in the new scheme implementation.”