The correct answer is: D. bad
The word “bad” is the most appropriate word to complete the sentence “Once I forgot the piece of paper on which the name of the hotel was written, I was as . . . . . . . . as lost.” This is because the speaker is describing how they felt when they realized they had forgotten the piece of paper. They felt lost and confused, and they did not know what to do. The word “bad” accurately captures the speaker’s feelings of confusion and uncertainty.
The other options are not as appropriate. The word “much” does not make sense in the context of the sentence. The speaker is not saying that they were as much lost as they were something else. The word “sure” does not accurately capture the speaker’s feelings of confusion and uncertainty. The speaker is not saying that they were as sure as they were something else. The word “good” does not make sense in the context of the sentence. The speaker is not saying that they were as good as they were something else.
Therefore, the correct answer is: D. bad