I want to say that the purpose of this passage is to say that enslaved workers and regular workers were far from the same. While regular workers had bad living conditions, enslaved workers had way worse living conditions and working conditions.
Happy , sad, angry/mad , mean , surprised / afraid.
The answer is C (most likely). The topic is fairly specific and you are focusing on one thing/organism.
Answer:
a border surrounding the zone of strong gravity near a black hole
Explanation:
The context clues , extreme zone is a boundary called the event horizon. This boundary acts like a point of no return. Once past it, there's no going back. Only black holes have such extreme gravity zones, and only black holes have event horizons " show that event horizon is a border surrounding the zone of a strong gravity near a black hole
The author creates suspense through the mystery surrounding the monkey´s paw.