<span>Deep processing of verbal information involves encoding the *meaning* of words, rather than its sound.</span>
Answer:
The Dursleys didn't have a direct conversation on this matter in the book. But when hagrid came to pick up Harry, and tells him about his parents then Harry mentions that the Dursleys have told him that his parents died in a car crash.
The reason I think they kept him in the dark is pretty obvious, that they hated the magic world, pretty much because of Petunia, as she was jeoulous that her sister (Harry's mother) was a witch and got admitted to Hogwarts and she didn't and they wanted to keep Harry away from that as they didn't want anymore of that "nonsense" and wanted to live a happy ordinary life.
Explanation:
The party platform is prepared during the national convention <span>with the caveat. That is pretty much it, there is no other way to further explain it.
I hope this helped let me know if you need more help! :)
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because initial research is a form of raw notes seeing that can be looked back on if in need.