Final answer:
The most helpful action a perinatal nurse can take is to arrange tours of different birthing facilities, providing the couple with a valuable firsthand experience and information to assist them in their decision-making process.
Step-by-step explanation:
The most helpful action a perinatal nurse can take for a woman and her partner exploring different birthing options would be to arrange tours of different birthing facilities. This provides the couple with a firsthand experience of the environment and services each facility offers, allowing them to make an informed decision based on their personal preferences. It also offers an opportunity to ask questions directly to the staff who would be assisting during the birth. While giving brochures and referring to social work for an insurance review are also useful steps, they don't offer the same level of engagement and firsthand insight as a facility tour would.