Most commonly missing primary teeth are:
(A) Maxillary central incisors (B) Mandibular central incisors (C) Maxillary lateral incisors (D) Maxillary canines
(D) Developmental agenesis of primary teeth is relatively rare. When several primary teeth fail to develop, other ectodermal deficiencies are usually evident. Most commonly missing primary teeth are maxillary canines.
Reference: McDONALD AND AVERY’S DENTISTRY for the CHILD and ADOLESCENT, 10th ed page no 64