【正确答案】 E

【答案解析】One would have to disentangle a skein or coiled and twisted bundle of yarn.
Note how the presence of the verb disentangle, which may be used both figuratively and literally, influences the writer's choice of words. In this case, while line and strand are possible choices, neither word possesses the connotations of twistings and tangled contortions that make skein the most suitable choice.