In which of the following statements, number 'three' is used in ordinal sense?

Ordinal numbers indicate position or order (first, second, third, etc.), while cardinal numbers indicate quantity (one, two, three, etc.). 'Third floor' uses 'third' to denote position in a sequence of floors—ordinal usage. The other statements use 'three' to indicate quantity: three rooms, three team members, three pencils—all cardinal usage. Ordinal sense specifically refers to ranking or ordering.