Emily Dickinson's poems have no titles, hence are always quoted

Emily Dickinson's poems have no titles, hence are always quoted by their（）.
A、topic sentence
B、first line
C、last line
D、theme
【正确答案】：B
【题目解析】：艾米莉·狄金森的诗歌风格独特，非同寻常(Unconventional)，她的诗歌没有标题，所以总是被他们的第一行引用。