Which of the following individuals is likely to have a longer-than-usual circadian rhythm?

a.)Dan, who has worked on a submarine far below the surface of the water for the last 3 months
b.)Jennifer, who works a usual 9 to 5 shift most days but is occasionally asked to work an overnight shift
c.)Lisa, who has to get up every morning at 6:30 am, just before sunrise, to teach classes that begin at 8 am
d.) Ira, who spends most of his days working inside the "Bird House" at his city's local zoo