The question definitely has layers to it as Sean alluded to. They were hoping to learn various things about you from it.

I would have picked apart and addressed each part of the acronym.

For A: Unlike Oracle, in SQL Server if you want each statement to implicitly start a new transaction then you must SET IMPLICIT_TRANSACTIONS ON. The default in SQL Server for "implicit transactions" is actually OFF, i.e. "autocommit mode", meaning if you want to start a transaction you must issue a BEGIN TRAN to start it. All statements are still atomic (the A in ACID) regardless of the setting meaning they either succeed or fail completely. An example would be if you issue an UPDATE statement to set all values of a TINYINT column to itself plus 1 and one of the rows had a value of 255 the entire UPDATE would fail, i.e. no rows would be updated.

For I: Megistal nailed it.

For C & D: You could check the results of the query from different sessions, and multiple times to make sure the same results were returned, which you mentioned.