(a) That's right. 

You were asked to select the most accurate answer.

The the most accurate answer is:  A has indicated that he wants acceptance by email and acceptance by email takes place as soon as it the computer system of the person to whom it is sent and is available to be read, even if it is only actually read later.  Acceptance therefore took place at 4:00 pm on March 10.

 Give yourself one mark for this answer.

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