The answer to that question is: D) Invisible
The Letter from Birmingham Jail, also known as the Letter from Birmingham City Jail and The Negro Is Your Brother, is an open letter written on April 16, 1963, by Martin Luther King Jr. The letter defends the strategy of nonviolent resistance to racism
Oh this is a hard one because, it technically has a subject and a verb (subject=he and himself verb=agreed); however it doesn't show a completed thought. I would say it's a sentence fragment, because it does not complete the thought.
Answer: Sentence fragment (this is what I would answer, because while it has a subject and verb it doesn't finish the thought.)
Writings and inscriptions (are) difficult to read, so either the experts or a computer (translates) the text.
verbs correctly complete the sentence:
are, translates
With compound subjects joined by or/nor, the verb agrees with the subject nearer to it.