However，Lewis and Brooks-Gunn(1979) suggest that （1宾从）infant’s developing understanding that（2同位语从句）the movements (they see in the mirror )are contingent [on their own], leads to a growing awareness that(3同位语从句)-- they are distinct [from other people].What’s the trunk(主干） of the appositive clause introduced by the second “that”--- “the movements……[on their own]”

A. SVP: the movements are contingent （依……而定）
B. SVO: the movements are contingent （依……而定）
C. SV: the movements contingent （依……而定）
D. SVP：they are [from other people].