题目:下列样式定义字符间距为0.5个字的间距、水平左对齐、垂直顶端对齐、有下划线正确的定义是( )。
A. p{text-decoration: underline; letter-spacing: 0.5em; vertical-align: top; text-align: left;}
B. p{text-decoration: 0.5em; letter-spacing: underline; vertical-align: top; text-align: left;}
C. p{text-decoration: left; letter-spacing: top; vertical-align: 0.5em; text-align: underline;}
D. p{text-decoration: underline; letter-spacing: 0.5em; vertical-align: left; text-align: top;}
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