The answer would be A.
The question you have to ask is, is it possessive?
Yes it is possessive.
The wing is owned by the bird. Its wing was broken.
It's means it is or it has.
It's would not make sense in this case because you can not put it is or it has into this sentence.
On the research team of the eminent virologist Dr. Thomas Francis, who was working on a flu vaccine, was a young physician<span> named Jonas Salk.</span><span>
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spider bite is a serious condition in which it should be advised to seek medical help
Answer:
The meaning of the word 'aloof' would be unfriendly.
Explanation:
This is because the sound you make when you say x is ex thus using a but when you make the b sound it sounds like be.