Since a Schedule K-1 was received, and since the IRS gets a copy of every government form you receive, the Schedule K-1 must be included. Answer all the interview questions in this section to capture your circumstances.
Regarding Form 1099-B, check the supporting details to see if it was included in the reporting. If it is included, delete this portion of the reporting since it will be captured by entering Schedule K-1.
For more information, see:
Where do I enter a K-1 that I received?
Guide to Schedule D: Capital Gains and Losses - TurboTax Tax Tips & Videos