Final answer:
The leading producer of soda ash in the world is the B)United States, primarily due to its rich natural reserves of trona in the Green River Basin of Wyoming.
Step-by-step explanation:
The country that is the leading producer of soda ash in the world is b. the United States. The United States has been a significant producer of soda ash thanks to its large natural reserves of trona, a mineral that is processed into soda ash, primarily in the Green River Basin of Wyoming. Soda ash is used in a variety of applications, including glass manufacturing, chemicals, paper, and detergents. China also produces a considerable amount of soda ash, but the United States remains the top producer.