Photo Manipulation and Ethics

A. The website talked about how Photojournalism Ethics were a great concern in media today. It talked about how easy and fast it is to edit photos with today's technology and how photos have been edited throughout the centuries. The website ends with proposing three different solutions for stopping or regulating Photo Manipulation.
B. Newspapers like New York Times and Washington Post offer strict guidelines to their photographers, minimalizing Photo Manipulation. 
C. Cropping a photo or turning up the brightness of a photo probably wouldn't be considered crossing the line into unethical manipulation. 
D. 
I believe that one of the most unethical photos from the website is the one of Abraham Lincoln. As a president's photographer/publicitor you have a lot of responsibility. You're showing the public who their leader is, and the fact that this photo went on to be famous and nobody knows that it's edited, just makes the deed worse.
E. 
I think the photo where Time straightened someone's teeth slightly is the least unethical. Straightening a famous person's teeth most likely happens all the time and although it is still unethical, it is not unethical to a terribly far point.