Select all sentences in which the indefinite-pronoun subject agrees with its verb.
Somebody at reception has found your scarf.✓Richtige Antwort
Somebody at reception have found your scarf.
Anyone with a valid badge is allowed upstairs.✓Richtige Antwort
Anyone with a valid badge are allowed upstairs.
Erklärung
Somebody and anyone are both singular indefinite pronouns, so has found and is allowed show the required agreement. Have found and are allowed incorrectly apply plural agreement to those singular subjects.