Greek mythology and Tolkien's Lord of the Rings both

The Red Hot Chili Peppers

a) were criticized by George Clinton for stealing his funk riffs b) still contains all of the original members c) have moved from the alternative scene to the mainstream d) were mentored by Berry Gordy of Motown records

What is a key factor (or factors) for a promoter in selecting an opening act to perform before a headliner?

a. None because promoters don’t select opening acts b. Selecting compatible music and not overshadowing the headliner c. Selecting a local act with a big following and no concern for music compatibility d. Always selecting mellow music to relax the audience before the headliner