The correct answer is B. Each clown and krumper, regardless of dance experience, is welcome to perform in the dance battle.
Step-by-step explanation:
In grammar, for a sentence to be correct it requires there is an agreement between the pronoun or subject in the sentence and the verb, this means if the subject or agent that performs the action is plural the verb should be plural as well; similarly if the verb is singular the verb should be singular. Additionally, in the case of indefinite pronouns such as each, everyone, anyone or someone the verb should be plural and in the case of indefinite pronouns such as all or both the verb should be plural. This means in the case of the sentence presented the subject is "Each clown and krumper" and due to the word "each" this subject is singular and therefore the verb should be "is" rather than "are". Thus, the sentence should be rewritten as "Each clown and krumper, regardless of dance experience, is welcome to perform in the dance battle".