If we add the ending 'her helmet aside' to the sentence 'The skier moved', we complement the sentence and make the verb moved transitive. "The skier moved her helmet aside." <em>This transitive verb needs a </em><em>direct object:</em><em> 'her helmet'. The endings in options B, C and D only make the verb 'moved' </em><em>intransitive</em><em> (verb that don't need an object.)</em>
