The correct answer is B, these are eggs of Trichuris vulpis, the dog whipworm.  Presence of T. vulpis eggs in human specimens may be associated with poor hygiene.  T. vulpis eggs can be acquired from the environment contaminated by infected dogs.  Children may acquire this infection by fecal-oral contamination.  Appropriate hygiene practices like hand washing associated with chemotherapy is recommended to control the infection in this setting.