Is George a reasonable person? Why or why not?

George is a reasonable man.  There are a number of examples that show this. 

First, George  knows that Lennie is challenged socially.  So, he tells Lennie several times to say little or nothing.  He anticipates what others might think, and he plans for it.  So, when they go to see the boss, his advice to Lennie is: "Be silent."  This shows that George is aware of Lennie's deficiencies. 

Second, George also knows that something bad might happen.  So, he gives Lennie a plan to meet in a certain location if things do not work out.  Again this contingency plan shows that George is reasonable. 

Third, even when George has a dream of owning land, he has a plan.  He picked out land and started to save.  More importantly, he allows Candy to join them.  He knows that he needs his money to make this dream come true. 

Finally, when George shoots Lennie at the end of the story, this, too, shows that George is reasonable.  He knows that something worse will happen to Lennie, if he men find him first. So, his act was calculated, reasonable, and even filled with compassion.