One of the Problems Associated with Assisted Reproduction Is That

One of the problems associated with assisted reproduction is that ____.

A) ​technology for effective gamete freezing has not been developed
B) ​the techniques for intrauterine implantation have not been fully explored
C) ​deleterious recessive alleles can be passed on to offspring
D) ​sperm cannot live outside the human body
E) the potential harm to the mother is largely unknown​