I opened the door quietly ............. my father. a) to not wake b) so I don’t wake up c) so as not to wake d) none of the above

To determine the correct completion of the sentence "I opened the door quietly ............. my father.", let's analyze the options provided:

1. Option a: to not wake - This phrase is grammatically acceptable, but it’s somewhat awkward in formal contexts.

2. Option b: so I don’t wake up - This option changes the meaning slightly and implies that the speaker is concerned about waking themselves rather than their father.

3. Option c: so as not to wake - This phrase is grammatically correct and clearly indicates the intention of not waking the father.

4. Option d: none of the above - This suggests that none of the other options fit, but that doesn’t seem to be the case here.

Final Answer

The most appropriate choice is c) so as not to wake, as it accurately conveys the intended meaning without any awkwardness in structure.