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Let $R$ be a ring and $M$ be a left $R$-module. Which of the following statements is true?
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A
The set of all submodules of $M$ forms a group under the operation of addition.
💡 Explanation:
The set of all submodules of $M$ forms a partially ordered set under the operation of inclusion, and it is closed under the operation of addition. Therefore, it forms a group under the operation of addition.