A can contains a mixture of two liquids A and B in the ratio $7 : 3$. When $10$ liters of mixture is drawn off and substituted by B, the ratio of A and B becomes $2 : 3$. The initial quantity of liquid A in the can was:

Options:

• A: $14$ liters
• B: $21$ liters
• C: $10$ liters
• D: $18$ liters

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