Answer:
B. Alexander becomes more convinced that Niall is innocent.
Explanation:
Alexander said that Niall couldn't have done it so it is clear that he believes Niall is innocent. :)
Proofreading is checking to see whether or not everything written is correctly grammatically, making minor changes in spelling, punctuation, etc.
Revising is changing the "subject" or characters, the general idea or something dealing with it. It changes the written work in a greater fashion, changing basically the idea.<span />
The answer to the question is A
There is virtually no cell migration in plants.