Final answer:
Canada officially removed its objector status and became a full supporter of the Declaration in 2018.
Step-by-step explanation:
The correct answer is C. 2018.
Step-by-step explanation:
In 2007, the U.S. Supreme Court ruled the Defense of Marriage Act unconstitutional. This event is unrelated to the question about when Canada removed its objector status and became a full supporter of the Declaration.
Canada officially removed its objector status and announced that it was a full supporter of the Declaration of Indigenous Peoples Rights in 2010.
Therefore, the correct year when Canada officially removed its objector status is 2018.