which of the following is correct in a Lewis diagram!?

which of the following is correct in a Lewis diagram!?
悬赏分：10 - 离问题结束还有 14 天 23 小时
Ⅰ The electrons are represented by dots.
Ⅱ Only valence electrons are represented.
Ⅲ The electrons are shown in different shells.
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A.ⅠandⅡonly
B.ⅠandⅢonly
C.ⅢandⅡonly
D.Ⅰ,ⅢandⅡonly
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我没学过啊！！！
我见过这个图
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请翻译一下全部的中文，再做下题目并解释下 ]