A recreational vessel 30 feet in length with no fixed fire extinguishing system in the machinery space must carry a minimum of how many 5-B portable fire extinguishers?

Why D is correct

Table 1 to 33 CFR §175.320(a)(1) requires two 5-B portable extinguishers for a vessel 26 feet or more but less than 40 feet when no fixed system is installed in the machinery space.