The correct answer is “very”.
The word “very” is an adverb that means “to a great extent” or “extremely”. It is used to modify adjectives and adverbs. In the sentence “I’m very pleased with it”, the word “very” is used to modify the adjective “pleased”. This means that the speaker is extremely pleased with whatever it is that they are talking about.
The other options are incorrect because they do not accurately reflect the speaker’s level of satisfaction. The word “much” is an adverb that means “to a great extent” or “a lot”. However, it is not as strong as the word “very”. The word “too” is an adverb that means “in excess” or “more than is necessary”. In the context of the sentence, it would imply that the speaker is pleased with something to the point of being excessive. The word “none” is an adverb that means “not at all”. In the context of the sentence, it would imply that the speaker is not pleased with something at all.
Therefore, the correct answer is “very”.