You clap with delight when your young son picks up a spoon. you laugh and applause when he later brings the spoon toward his mouth. when he places the spoon in his mouth you hug and kiss him all over. it is most likely that you

Shaping is a conditioning paradigm utilized principally in the experimental examination of conduct. The strategy utilized is differential support of progressive approximations. It was presented by B. F. Skinner with pigeons and later expanded to puppies, dolphins, people and different species.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."