In which sentence is the comparison in the correct form? it is the more tall building in the world. it is the tallest building in the world. it is the taller building in the world. it is the most tall building in the world.

The comparison is in its correct form in the sentence "It is the tallest building in the world".

Explanation: All the sentences provided want to express the idea that there is a building that represents the highest degree in terms of size. In that way, the correct thing is adding a superlative adjective in the sentence and not a comparative adjective. Therefore, as "taller" is a comparative adjective and "more tall" intends to express comparison, they are incorrect options. The superlative form of the adjective "tall" is "tallest" (and not "most tall"); therefore, the correct option is "It is the tallest building in the world".

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