What choice does George make in of mice and men & I need. evidence with it

The choice George makes in Of Mice and Men was that he decided to kill his best friend Lennie. George's reason for shooting Lennie was to keep him from experiencing the agony that would have proceeded the consequences of his actions. Lennie would have been lynched or beaten and then killed if he was caught. George also knew that even if they escaped, it would be just a matter of time before Lennie had another "accident" and killed someone else. George knew he couldn't protect Lennie anymore from society. He also couldn't protect society from Lennie. From George's perspective, killing Lennie before he was caught was the only good thing to do.

This is from the book on the last page on how he killed Lennie.

" And George raised the gun and steadied it, and he brought the muzzle of it close to the back of Lennie’s head. The hand shook violently, but his face set and his hand steadied. He pulled the trigger. The crash of the shot rolled up the hills and rolled down again. Lennie jarred, and then settled slowly forward to the sand, and he lay without quivering. George shivered and looked at the gun, and then he threw it from him, back up on the bank, near the pile of old ashes" (Steinbeck 52).

If you look before this quote--in the actual book--you'll get a sense of the tone and emotions. I suggest reading the book, though; it's a good book with great themes & morals.