How many unique vessel types are listed among the assets?

• A. 3
• B. 4
• C. 5
• D. 6

Answer: (B)

Counting how many unique vessel types appear means identifying distinct categories rather than counting each asset separately. Take the list of assets and note the vessel type for each one, then keep only one instance of each type. The total you end up with is the number of unique vessel types.

In this set, there are four different vessel types represented, with several assets sharing the same type. That’s why the correct count is four. If you counted every asset as a new type, you’d get a larger number; if you grouped different kinds together too generously, you’d get a smaller number.