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.  

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wegner's theory did not explain how the continents could move

explanation: