The correct answer is Option A.
We are to identify the adverb of place - the place where 'she is lying'.
Option B- 'Ahead' means 'further in space' i.e. in the lead of someone else. However in the sentence 'she' is alone - there is no one else. So ahead is not the suitable adverb.
Option C- 'Aboard' means on or into the ship. Here 'she; is lying- Hence even this option is ruled out.
Option D- 'Away' means a different position, but in the given sentence 'she' is at the same place.
Option A-'Abed' means in bed. This perfectly describes the place where the action of lying takes place.
Hence option A is the correct answer.