. 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 solve this question, we need to determine which of the provided options correctly completes the sentence.

Step 1: Analyze the Sentence

The context of the sentence involves a reason for opening the door quietly, which is to avoid waking the father.

Step 2: Evaluate Each Option

1. a) to not wake: This phrase is somewhat informal and may not be the best choice in this context since it lacks the elegance of the other options.

2. b) so I don’t wake up: This option suggests the speaker is trying not to wake themselves, which does not fit the context since the concern is about waking the father, not themselves.

3. c) so as not to wake: This option correctly conveys the intention of not waking the father in a grammatically and stylistically appropriate way.

4. d) none of the above: This option implies that none of the previous choices are correct, which is not the case here.

Final Answer

The best choice is c) so as not to wake.