Congratulations! You are correct!

5.

A. We want roses gardenias lilies and lavender in the bouquets at, our wedding.  

B. We want roses, gardenias, lilies, and lavender in the bouquets at our wedding.

C. We want, roses gardenias lilies and lavender in the bouquets at our wedding.

D. We want, roses gardenias lilies and lavender, in the bouquets at our wedding.