Final answer:
None of the options presented (Indian Removal Act, Royal Proclamation of 1763, Gradual Civilization Act, Indian Act) correctly match the description of the Upper Canada 1850 legislation as they pertain to different legislative acts and timeframes.
Step-by-step explanation:
The question refers to 1850 legislation in Upper Canada which prohibited anyone but the Crown from dealing with Indigenous lands. This description does not pertain to the Indian Removal Act of 1830, which mandated the relocation of Native tribes east of the Mississippi River. Neither does it relate to the Royal Proclamation of 1763, which aimed to prevent further conflict on the frontier by forbidding White settlement west of the Proclamation Line. The Gradual Civilization Act and the Indian Act imposed greater controls on the Indigenous Peoples; however, the Indian Act of 1876 came after the date mentioned, and the Gradual Civilization Act focused more on assimilating Indigenous peoples.
Therefore, the correct answer to the question, based on the information provided, would not be among the options listed as none directly correspond to a legislation from Upper Canada in 1850 regarding crown dealings with Indigenous lands. The options given relate to different pieces of legislation and acts from various dates.