Which of the following sentences contains a linking verb? A. Railroads replaced stagecoach travel.
B. They crossed the nation much more quickly.
C. Cars became popular in the early twentieth century.
D. Some people still prefer trains to planes for long-distance travel.

C

Explanation:

All the 20 linking verbs are: am, appear, are, being, been, become, be, seem, stay, sound, smell, was, were, taste, turn, is, remain, grow, look, feel. Became is the past tense for become.

a fable" i don’t have much to go on

the statement flat characters usually only have one trait that is developed in their story lines is true.