Based on the concerns related to gene therapy as presented in your question, the following options could be considered valid concerns:
A. The side effects and/or risks of gene therapy are still relatively unknown. B. Altering the genetic make-up of an unborn child would be, in effect, playing God. C. Who would regulate the practice; government, doctors, big pharma, religious groups? D. When alternative treatments are viewed as effective and relatively free of side effects, should gene therapy be considered?
Since all these aspects may contribute to participants' hesitations about gene therapy, the correct response would be:
All could be possible concerns.