As is known, the deciduous tooth buds give rise to the underlying permanent ones (Fig.4 (illustration for the anterior teeth).  Where LR C is missing, most likely the permanent canine (LR 3) is missing (Fig.5,6), whether B is shifted or not. 

In fact, in this case, the permanent lateral incisor (LR 2) is missing (Fig.3). 

Identity of a Tooth Last Next

Xin Wei, DDS, PhD, MS 1st edition 07/04/2016, last revision 09/15/2019