Which of the following statements is false? 

A. During preimplantation, radiation damage can only result in the death of the embryo. If the embryo survives, it grows normally. 

B. During organogenesis, the main effects of radiation is the production of anomalies in the structure of the embryo and growth retardation. 

C. The damage caused by radiation on the fetus include effects on the hematopoietic system, liver and kidneys. Growth retardation and lethality have also been documented. 

D. Higher doses of radiation are required in order to cause lethality in the early stages of embryonic development than in the fetal period.