Under 33 CFR §164.25, the emergency steering drill required before a vessel operates on navigable waters of the United States must be conducted and logged within what time period prior to entry, unless conducted on a regular basis at least once every three months?

Why C is correct

33 CFR §164.25(d) requires the emergency steering drill to be conducted within 48 hours prior to entry and logged in the vessel logbook, unless the drill is conducted and logged on a regular basis at least once every three months. The 12-hour figure applies to the general pre-departure equipment tests under §164.25(a).