Final answer:
The leading minerals in the Interior Plains include oil and gas, coal, and potash, making 'All of the above' the correct answer.
Step-by-step explanation:
The leading minerals found in the Interior Plains include a variety of valuable resources. Among them, the most notable are oil and gas, which are abundant in the region, particularly in the province of Alberta. The area is well-known for its extensive fossil fuel exploration, and it possesses large reserves of coal, oil, and natural gas. Furthermore, Canada's Interior Plains are also rich in potash, which is a key mineral used in fertilizers to aid in agricultural productivity. Consequently, the answer to the question is d) All of the above, as oil and gas, coal, and potash are all leading minerals found in the Interior Plains.