What type of Text structure does this passage use

A. Causal

B. Sequential

C. Comparative

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“At sundown the fairies were still working on the sandy plot. Two days went by. And a week. And another. Because just as one set of footprints were got rid of, another set appeared. By the end of the second week, in fact, the fairies had covered the entire plot with footprints. At last they gave up and let the woman live.” -“The Wise fool” (West African folktale)