Each distress signal and self-activated smoke signal must be replaced not later than the marked date of expiration, or not more than how many months from the date of manufacture?

Correct Answer: Option B — 42 months

USCG and SOLAS regulations stipulate pyrotechnic distress signals and self-activated smoke signals must expire not more than 42 months (3.5 years) from their date of manufacture to ensure chemical stability and reliable ignition during emergency use.