Which of the following settings would you expect to have the least seasonal variation in job arrivals, if we take the "season" to be just one day (for example, let's say the day in question is the first Wednesday in March - which of the following settings has the least seasonal variation in job interarrival times across that one day)?

a) In-N-Out burger.
b) The nearest large oil refinery.
c) The elevator in the SFEBB building.
d) The pec fly machine (or any other exercise machine) at the Student Life Center.