It would simply be "They respect each other".
Respect in time tenses is either spelled, "Respected", "Respect", or "Will Respect."
The fact that it's third person does not change the word since it can be said as "I respect you", "You respect yourself" "They respect each other"
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I believe the correct answer is D. that he is a very strong judge of character.
Even though he is young, Huck knows that his father is just a drunk loser, who would milk him out for money to buy alcohol. Huck is a troubled child who is used to mischief, so he has learned to tell real danger from mere annoyance. His father's behavior does frighten him at first, but it only takes a moment for him to realize that there is no reason to be afraid.
I think he means that humans don’t like being alone. It’s our nature to find someone or have a companion throughout our lives. We instinctfully talk to people to interact or make friends. That’s what I think he means