What is the minimum number of B-II hand portable fire extinguishers required on board a 105 GT uninspected towboat with a 7500 B.H.P. plant (including the machinery space)?

Correct Answer: Option C — 9

Under 46 CFR Table 25.30-20(a)(1), a vessel of this size and horsepower requires a specific number of B-II extinguishers based on the machinery space volume and total gross tonnage. For a 105 GT vessel with 7500 BHP, the regulatory requirement is nine B-II units.