19) Scarcely had he rolled himself in his blanket when he heard a slight rustling at the entrance, as if some creature were preparing to share his retreat.
Read the passage. Look at the underlined section marked number (19). There may be a mistake in the way the sentence is written. If you find a mistake, choose the answer that corrects the mistake. If there is no mistake, choose ‘Correct as is.’

A) Although he had scarcely rolled himself in his blanket when he heard a slight rustling at the entrance, as if some creature were preparing to share his retreat.
B) Scarcely had he rolled himself in his blanket. When he heard a slight rustling at the entrance, as if some creature were preparing to share his retreat.
C) Scarcely had he rolled himself in his blanket hearing a slight rustling at the entrance, as if some creature were preparing to share his retreat.
D) Correct as is.