Correct Answer: D
Explanation:
One should have to disentangle a skein or coiled and twisted bundle of yarn.
Note how the presences of the verb disentangle, which may be used both figuratively and literally, influences the writer's choices of words. In this case, while line and strand are possible choices, neither word possesses the connotations of twisting and tangled contortions that make skeins the most suitable choice.