In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3

A. 4 parts of acid to 4 parts of water

B. 4 parts of acid to 6 parts of water

C. 6 parts of acid to 4 parts of water

D. 4 parts of acid to 8 parts of water

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