Which of the following is the best example of positive peer pressure?

a. your friends say no to the dinner your mom cooked and suggest ordering pizza and wings instead.
b. your teammates spend extra time working out after practice today, and they tease you for not joining them.
c. your siblings spend their weekend playing video games and keep asking you to pass on playing outside.
d. your friends sign up for a 5k run and invited you to train with them and run in the race.