Which of the following is an example of stimulus shape transformation?

a. Taking a line drawing of a bed and slowly changing it into the letters b-e-d to help a child learn to read the word "bed"
b. Using the most-to-least prompting to teach a child to independen tly write the word "dog"
c. Teaching name writing by tracing the letters in the name and gradually fading out the lines in the model
d. Teaching a child to read the word "cat "by pairing the word with a picture of a cat and gradually fading out the letters of the word