The correct way to complete the sentence is "the most wisely," and the degree of comparison here is the superlative degree, as explained below.
The superlative degree is used to compare someone to an entire group of people, or even to the whole world. This is how to form the superlative degree:
In the sentence we are supposed to complete here, Henry is being compared to a whole group of spectators, which means we must use the superlative degree. Therefore, the correct way to complete it is with "the most wisely."
Learn more about the superlative degree here:
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