Belle and Diamond Are Spending the Day Together

Belle and Diamond are spending the day together.First,they have breakfast at McDonalds,then have a quick work-out at Curves followed by a massage at Massage Envy,and getting their nails done a Red Persimmon.They finish their day with getting their hair done at Fantastic Sams followed by ice cream at Ben & Jerry's.What do these businesses have in common?

A) They are franchises.
B) They do not require expertise to start as training is provided by the seller.
C) They have few employees who are all experts in their particular field.
D) They all provide services rapidly and permit walk-ins.