The statements that accurately describe aspects of the class structure are:
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The native peoples were very poor and worked in the fields and in the mines.
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Peninsulares were native-born Spaniards who held all the important positions in the colonies.
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Creoles were of Spanish descent but born in America and therefore seldom held government positions.
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Mestizos were of mixed race, Spanish and Indian, and were generally poor, if free.
Therefore, all the options listed are correct, except for the statement about "Milanos," which seems to be a mistake or misnaming, as there is no widely known reference to a group with that name in historical class structures.