What can be found if a child with Ⅲ grade (levels) laryngeal obstruction?

A. Stridor and dyspnea just can be found after activities with normal lung and heart sounds

B. Exhaustion，lethargy，shallow （weak） breathing，pallor，silent lung，arrhythemia，weak heart sound

C. Stridor and dyspnea

D. Dysphoria，cyanosis，sweating，reduced lung sound，tachycardiac，inspiratory recess of soft tissue

E. All of above are not correct