Click on the question mark chose the most reasonable inference based on the text evidence and what you know
A. corneas can be transplanted from one person to another B. they have also been working on early visions of a bionic eye C. doctors are experimenting with a corneal transplant too D. no matter what its incredible to see how far vision enchantments have become

In my opinion I think it's A but if you would include the evidence, that will  help me a lot

in "letter from a birmingham jail," king argues that there are four basic steps in any nonviolent campaign: "[c]ollection of the facts to determine whether injustices exist; negotiation; self purification; and direct action." finally, direct action is taken and acts such as boycotts and sit-ins are staged.

- "when these words are put together to convey a meaning it is known as a sentence. a sentence is a group of words that makes complete sense. placing of words in a sentence is very important. the second sentence is a question."