David and Kathy Like to Take Their Young Son,Chaz,to Moe's

David and Kathy like to take their young son,Chaz,to Moe's for lunch after church on Sundays.While they like to eat at Moe's at any time,Sunday is particularly good because it's "kids-eat-free" day at Moe's southwestern grill.Until Moe's began the reduced pricing program,Sundays were very slow.Now it is one of the busiest days of the week.This price reduction was a way to contend with the service characteristic of:

A) variability.
B) perishability.
C) intangibility.
D) inseparability.
E) simultaneous production and consumption.