The correct option to fill the blank is:
The comparative is characterized by the following structure:
With this form, it is required to mention two nouns to compare one with the other.
In the case of the superlative, the following structure is usually used:
As can be seen, in the superlative form there is no need to mention another noun, but a complement of place is regularly used, for this reason, the appropriate choice is "the hottest".
More information about Superlatives in:
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