Which statement best explains how to identify the text structure used in the excerpt from "for want of a horseshoe nail"?

then he spurred his horse to ride toward the broken line and rally the men to turn and fight. he was hardly halfway across the stony field when one of the horse’s shoes flew off. a few steps more and another shoe came off. the horse stumbled, and king richard was thrown to the ground.

a. the text structure is chronological; words like flew off and steps indicate this.

b. the text structure is sequence; words like rally and fight indicate this.

c. the text structure is compare and contrast; words like spurred and ride indicate this.

d. the text structure is cause and effect; words like stumbled and thrown indicate this.