The breaking strength of the service lines of the rockets used with an impulse-projected, rocket type line throwing appliances is __________.

Correct Answer: Option B — 500 lbs

USCG and SOLAS standards for line-throwing appliances specify that the service line must have a minimum breaking strength of 2.25 kilonewtons, which is approximately 500 pounds. This strength is necessary to ensure the line can withstand the force of the rocket launch and the tension during retrieval operations.