These are not "all" the dependent territories. What about American Samoa, Wallis & Futuna, New Caledonia, the Chatham Islands and Tokelau for example? Also, Cook Islands are controlled by New Zealand, not UK.
Great idea for a quiz! I’d change “dependent territories” into just “territories” though, as not all are dependent territories, e.g. Easter Island is part of Valparaiso region, Niue and Cook Islands are constituent countries of the Kingdom of New Zealand, etc.