Answer:
Look below.
Explanation:
The author developed a bias in favor of climbing by exemplifying the benefits that climbing has on your mental and physical self. The author uses persuasive words such as better and hooked. The author uses something common that every one struggles with as a solution with climbing.
The best answer for the underlined word would be A: Vital
crucial means important or urgent.
required could be it but it does not imply a great amount of necessity.
The rest of the options don't even relate to this question.
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The correct answer here is "in the air". This phrase acts as an adverb of place as it describes where the virus is located. These phrases can modify a verb, adverb and adjectives and tells us more information about them like in this example "where" something is. They can also tell us about "how" or "when" or "why".
