The relationship between Antonio and Felix is that they are rivals, but they were once close friends, as option A shows.
Antonio and Felix were best friends because they both had the same passion to become professional boxers.
They started training together and helped each other to get better and better with their techniques and skills.
This created great intimacy and companionship between them, however, a boxing competition arrived in the city and that would be the first step towards becoming a professional fighter.
Both wanted to participate in the competition, but that would make them rivals. They agreed to participate and parted ways for a while so he could focus on winning the fight.
The rivalry did not interfere with the friendship as they both continued to cheer and support each other.
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