Answer:
The correct answer is "most handsome"
Step-by-step explanation:
Superlative adjectives in English language are used to describe the extreme quality of a thing in relation to a group of things.
The superlative is formed by "the"+"adjective"+"est" in the case of short adjectives such as "the strongest".
In the case of long adjectives, the superlative is formed by "the"+"most"+"adjective" as in the example provided "the most handsome".