Which of the following teeth is least likely to have two root canals?

The maxillary lateral incisor almost always has a single root with a single canal (>95% of cases). Mandibular premolars, particularly the first premolar, have a notably high incidence of two canals (up to 25% in some populations). Mandibular anterior teeth (central and lateral incisors) frequently have two canals (up to 40%). Mandibular first molars almost always have two roots and three or more canals. Therefore, the maxillary lateral incisor is least likely among the options to have two canals.