Final answer:
In mixtures 3 and 4, all components maintain their physical state, making them heterogeneous mixtures, while the components in mixtures 1, 2, and 5 do not, as some dissolve in water to form homogeneous mixtures.
Step-by-step explanation:
The question is asking which mixtures have ingredients that all maintain their physical state. A mixture where all ingredients maintain their physical state means that the ingredients don't change into a different state; they remain solid, liquid, or gas, as they were before mixing.
Mixtures 3 (iron filings and sand) and 4 (pebbles, wood chips, soil) are examples where all ingredients maintain their physical state, as they are heterogeneous mixtures. In these mixtures, the components are simply physically combined and can be separated by physical means without changing their original state. In contrast, mixtures 1 (salt, hot water, sand), 2 (sugar, hot water, salt), and 5 (powdered soap and hot water) involve at least one ingredient (salt, sugar, or powdered soap) that dissolves in water, forming a homogeneous mixture or solution, thus changing the state of that ingredient from solid to an aqueous solution.
Therefore, the correct answer to the question is "A. Mixtures 3 & 4 only" because they are the mixtures in which all components maintain their physical state.