Answer: D) Tommy, in an effort to maintain clowning's positive roots, invites dancers to weekly performance battles.
Explanation: Subject-verb agreement means the subject and verb must have the same number (both singular or both plural). From the given options, the one that has a correct subject-verb agreement, is the corresponding to option D: Tommy, in an effort to maintain clowning's positive roots, invites dancers to weekly performance battles, because the subject is singular (Tommy), and the verb is also in singular form (invites).