Why were six traits of writing developed?
a. to determine the best technique for a specific writing assignment
b. to teachers evaluate their students' writing
c. to students understand the steps in the writing process
d. to find ways for students to develop topics for writing

The answer is  B. to help teachers evaluate their students' writing.

Teachers use the six traits of writing to grade and evaluate their student's writings all the time. It tells them what their student's need help when it comes to improving their writings.

a fable" i don’t have much to go on

what passage are you referring to