The writer's purpose for the essay as based on the given thesis is, To show how using a list of examples can strengthen a claim.
Claim is a state of formal request without providing evidence.
Because, in the letter to Birmingham Jail, Dr. King lists out all the examples of the injustices that was happening towards African-American with the example of all the negative impact like racism and how it is important to fight and break this unjust law. So, he claim the importance of right to equality for all which will make America free from injustice of racism. Which acts out and support his claim of bring justice and civil obedience for everyone.
Hence the correct option is, D. To show how using a list of examples can strengthen a claim.
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