<span>A) In the selected sentence, the word gardening is a gerund, and the gerund phrase functions as the subject.
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The Title hope that helps :)
This uses A. non-sequitur logic.
This is because the second inference does not rely upon the first. Just because someone likes the <em>Star Wars</em> movies does not mean that they also like the <em>Harry Potter </em>movies. These are two unrelated things, so a person does not automatically like both. <span />