The examples of unethical dark patterns on owned media from your provided choices are:
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Stating that only a few items remain for purchase online when many items are available - This creates a false sense of urgency and can manipulate consumer behavior.
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Offering "free" trials on a website that are actually paid subscriptions - This misleads users into thinking they are not incurring costs when, in fact, they may be automatically signed up for a paid service.
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Disguising ads to look like a form of web page navigation - This blurs the lines between content and advertising, leading users to accidentally click on ads.
The choice providing buttons on an online shopping cart to remove listed items is generally a standard feature that enhances user experience, not an example of an unethical dark pattern. Therefore, it should not be selected.