What does the term boondoggle most likely mean as used in paragraph 13

Option D,  to protect American Indian lands from white settlement, is the right answer.  

Tecumseh was a leader of the Native American community, who wanted to stop the settlers of America either by peace or by force, to conquer their land. Therefore in order to fight with the American force, he came into a formal alliance with Great Britain. Because when it came to the rights of the native Americans, the British appeared like the "lesser of two evils", Hence Tecumseh made an alliance with them.