Final answer:
Uranus's moons are primarily composed of dust, gas, and ice, with organic compounds like carbon and hydrocarbons also present, reflecting common materials in the outer solar system. The correct answer is option: b) dust, gas, and ice.
Step-by-step explanation:
The physical materials that most likely formed the composition of Uranus's moons include dust, gas, and ice. These moons, along with the uranian rings, have a composition that includes dark, organic compounds such as carbon and hydrocarbon compounds.
This is similar to the materials found in comets and asteroids in the outer solar system, which are also known for their ice-dominated compositions interspersed with dark, carbon-rich material. Many of the moons in the outer solar system differentiated during formation, resulting in structural layering, with cores of rock and metal, and upper layers and crusts of very cold, hard ice.