Which acrobatic combination earns a bonus of +0.20 on the beam?

The combination of B + D earns a bonus of +0.20 on the balance beam because it features a mix of skills that require a higher level of difficulty. In gymnastics, combinations that include different-valued elements often yield bonus points, encouraging gymnasts to showcase more advanced acrobatic series.

In this case, the "B" and "D" elements represent two distinct skill categories; B typically indicates a lower difficulty element while D represents a significantly more challenging skill. This combination not only demonstrates a gymnast's ability to execute a series of connected movements but also highlights their adeptness at integrating varying levels of difficulty within their routine, justifying the additional bonus.

The other combinations do not meet the criteria for the +0.20 bonus due to either being composed of similar valued skills or lacking the necessary difficulty spread. By understanding the value assigned to each skill and the criteria for bonus earning, gymnasts can effectively plan and execute their routines to maximize scoring potential.