Peter is compelled by the need to save things regardless of their value. over the years, he has collected numerous newspapers, magazines, bags, clothes, and other things in his house. despite his family's best efforts, he is unwilling to get rid of these things. peter also has poor organization and decision-making skills, and his house now poses a severe fire hazard. in the context of disorders related to obsessive-compulsive disorder (ocd), peter is most likely to be diagnosed with

Disposophobia or Compulsive Hoarding. Those who suffer from this condition have a problem discarding any item that they might have in the house or office even when they know that it is of no use. They usually have the opinion that it will be used in the future thus it is best if it sticks around. Peter fits the diagnosis as he is compelled by the need to save things regardless of their value.

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."

answer; the parasympathetic nervous system;