The study found that the birth defect rate of test-tube babies is about 9% and that of naturally-conceived babies is about 6.6%. The proportion of eye defects in these two groups of infants is 0.3% and 0.2%, respectively, and the proportion of cardiac abnormalities is 5%. And 3%, the proportion of reproductive system defects was 1.5% and 1% respectively. Therefore, it can be explained that IVF technology results in higher rates of birth defects in IFVs than naturally conceived babies. Which of the following, if true, would most likely challenge that conclusion? ['IVF undergoes in vitro fertilization and embryo transfer, and human manipulation will increase the risk of fertilized egg damage.', 'Most parents who choose IVF technology have abnormal reproductive system functions, and these abnormalities will increase the failure rate of this technology.', 'IVF can produce a lot of fertilized eggs during the IVF phase, and only the best quality can be selected for the mother to conceive.', 'Parents of IVF are much older than parents of naturally conceived babies. The older the parents, the higher the rate of birth defects in the newborn.']