Read the passage below carefully and then answer the question. (from “The Velveteen Rabbit,” by Margery Williams)

For a long time he lived in the toy cupboard or on the nursery floor, and no one thought very much about him. He was naturally shy, and being only made of velveteen, some of the more expensive toys quite snubbed him. The mechanical toys were very superior, and looked down upon every one else; they were full of modern ideas, and pretended they were real. The model boat, who had lived through two seasons and lost most of his paint, caught the tone from them and never missed an opportunity of referring to his rigging in technical terms. The Rabbit could not claim to be a model of anything, for he didn't know that real rabbits existed; he thought they were all stuffed with sawdust like himself, and he understood that sawdust was quite out-of-date and should never be mentioned in modern circles. Even Timothy, the jointed wooden lion, who was made by the disabled soldiers, and should have had broader views, put on airs and pretended he was connected with Government. Between them all the poor little Rabbit was made to feel himself very insignificant and commonplace, and the only person who was kind to him at all was the Skin Horse.

The selection in bold is an example of what?

A. a signal word.

B. a cause.

C. an effect.

D. a main idea.