Directions: The sentences given below are labelled as A, B, C, D and E. Choose the correct order of sentences from the given choices to construct a logical paragraph.

A. Snoring is not just a recipe for marial discord. B. This disorder, in which breathing stops many times a night, can detonate dangerous cardiovascular stress. C. It can be life-threatening, too, when it is a part of sleep apnea. D. Now a new study has idenified the tissue and chemical changes that stir up he problem,a finding that could lead to novel drug treatments. E. But scientists have long puzzled over why we should respond so fiercely to dips in the oxygen supply.