The correct answer is option a) considerable.
In line 21, "fair" most nearly means considerable.
Generally speaking, the adjective "fair" denotes a high degree [ex: She'll be fair glad to meet you].
Fair is used in the sentence above to describe the significant amount of doublespeak that has occurred since Dolly's birth in the area of genetic identification. So, we might infer that "fair" refers to a high degree.
What is considerable?
Considerable can be used to express anything that is significant and deserving of attention or respect.
People may urge you to offer your substantial abilities to charity organizations if you are an exceptional singer, dancer, musician, writer, or other comparable professional.
They will still urge you to give even if you're not a really good singer, dancer, musician, or writer, but they'll probably ask for cash instead.
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