Final answer:
The nurse should review the literature provided by the genetic counselor, answer questions within their competency, and recommend a community support group for additional support.
Step-by-step explanation:
When addressing the concerns of parents who have recently had a child with Trisomy 21 and are considering the risk of having another child with the same condition, the most appropriate action for the nurse would be to A. Review the literature provided by the genetic counselor and answer any questions to the best of their ability. If the nurse is unable to answer any queries, they should facilitate communication with the genetic counselor. Alongside this, the nurse can suggest available support systems such as B. recommending a community support group for parents of children with Trisomy 21, as this can provide additional emotional support and resources.