What type of dismount is specified for a BB gainer at level 10?

The correct answer is that a 1/1 gainer dismount is specified for a BB (balance beam) gainer at level 10.

In gymnastics, a "gainer" refers to a dismount where the gymnast performs a backward rotation while also moving forward off the apparatus. At level 10, gymnasts are expected to demonstrate a variety of skills that include specific requirements for their dismounts. The 1/1 gainer indicates that the gymnast performs a full twist (360 degrees) while executing the gainer off the beam. This requirement is appropriate for level 10, where judges are looking for a combination of difficulty, technique, and execution that aligns with the established difficulty standards for this level.

The other options imply more complex twists or variations that exceed the difficulty expected at this rating or do not meet the requirements as clearly outlined for level 10. Therefore, understanding the correct specifications for dismounts helps judges fairly assess the gymnast's routine within the given level's context.