The author supports her claim in the first paragraph by assessing whether workshops can improve writers’ ability to judge their own works. (option A)
We can describe a claim as being a statement made or an opinion given by someone. Whenever someone claims something, they must support that claim with explanations or evidence.
In the particular text we are analyzing here, the author supports her claim that writers should "go to writers' workshops" by assessing how such workshops help them judge their own works.
With the information above in mind, we can choose option A as the correct answer.
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