Which of the following of Dalton's proposals is still valid?

Question

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Dalton's atomic theory, despite being developed in the early 19th century, still holds several valid concepts. Among these, the ideas that atoms of different elements can combine to form compounds (A), that they can combine in small whole number ratios (B), and that they can combine in more than one whole number ratio to form different compounds (C) are all foundational principles in chemistry that remain accurate. These principles are integral to understanding chemical formulas, molecular structures, and the stoichiometry of reactions.

Which of the Following of Dalton's Proposals Is Still Valid