According to the poster, it can be inferred that the main message is California is an excellent location for immigrants who are seeking land to farm (option A).
The poster shows a very colorful poster with a cornucopia with many fruits. Additionally, it has a text that specifies the benefits that California offers to immigrants, such as:
Based on the above, it can be inferred that the message of this poster is an offer to immigrants to come to California to have land to farm.
Note: This question is incomplete because the poster is missing. Here is the poster.
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