Level is used when nuisance contamination is present only requiring the lowest form of chemical and/or respiratory protection. (operations, page 7 of 20)

The correct answer is level D.  

Explanation:

PPE or personal protective equipment is developed to offer protection from illnesses or serious injuries resulting due to coming in contact with radiological, chemical, electrical, physical, mechanical, or other hazards. There are many levels of PPE.  

Of these level, D protection is mainly a work uniform and has an application for nuisance contamination only. It needs only shoes or boots and coveralls. Another PPE is based upon the situation. It is not applicable to any location where skin or respiratory hazards prevail.  

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.