According to the rules of civil procedure, a citation may normally be served on any day except a ___________?

The correct choice regarding when a citation may not be served is Sunday. This is aligned with general legal principles that many jurisdictions recognize, which typically set aside Sundays as a day where legal processes, including civil citations, should not be served. The rationale behind this is often rooted in consideration for religious observance and societal norms, making Sunday a day of rest for many individuals.

In many jurisdictions, the rules of civil procedure explicitly outline which days are appropriate for serving legal documents. By excluding Sundays, the legal system ensures that individuals are given a fair opportunity to respond to legal actions without the pressure of being served on a day traditionally designated for rest and worship. This practice upholds the principles of due process by allowing individuals adequate notice and a chance to prepare for legal proceedings.