When mailing an amended return, you only need to include the tax Forms & Schedules that changed, along with any supporting documentation or forms - like your W-2c. So, obviously you need to include the 1040-X, Form 1040 & it's schedules that may have changed. If Schedule B or Schedule D didn't change, you don't need to include them. That said, it's better to send a form that's not needed than to omit one that is. They won't penalize you for sending a form that's not needed.
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