Which is the easiest to read?

Definitely J. D. Salinger’s The Catcher in the Rye hands down. It is the most modern and easiest to relate to and it doesn't have long dry or boring passages in my opinion. It also has an interesting story line that will probably appeal to you more than the others. The grapes of Wrath is more of an epic saga, it is interesting but I found it to be a bit slow at times.. It is however very descriptive. My second choice would be Steinbeck.