Answer: B
Z00.129 is the appropriate code here because it is used to specify the encounter for routine child health examination without any abnormal findings.
Option A is not correct because Z00.5 is used to specify the encounter for examination of the potential donor of organ and tissue.
Option C is not correct because Z00.2 is used to specify the encounter for examination for a period of rapid growth in childhood.
Option D is not correct because Z00.3 is used to specify the encounter for examination for adolescent development state.