The best word to fill in the blank is "undermine."
So the complete sentence would be: "The salesperson tried to undermine us into paying twice what the watch was worth."
However, please note that "undermine" typically means to weaken or damage something, often in a covert way. Depending on the context, you might be looking for a word that conveys manipulation or deceit; a more fitting option could have been "coerce" or "pressure." Unfortunately, those words do not appear in your list. If you're specifically looking for a more communicative fit, "instigate" could also convey some degree of manipulation, though it's usually used in a different context.
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