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Explanation:

In B, the conditional tense with ‘would’ in the first part is constructed incorrectly. 
In C the first part should be ‘When you come to see me...’ 
In D, the placement of ‘both’ is incorrect. It should be placed after ‘to’. 
Here, the ‘both’ is attributed to ‘two letters’ or ‘two documents’. Statement A is constructed correctly. 
Hence, the correct answer is option 1.