Based on typical rainfall patterns in the United States, the area that generally receives the most rainfall among the options provided is the northwest coast of Washington State (Option 3). This region is known for its wet climate, particularly in areas like the Olympic Peninsula and cities such as Seattle, which receive significant annual precipitation compared to the other regions mentioned.
In contrast, the areas in Illinois and northeast Montana typically experience moderate rainfall, while west Texas is known for its arid and semi-arid conditions with much lower average precipitation.