Final answer:
Whataburger expanded to its 100th location in the year 1980, marking a milestone thirty years after its inception.
Option b is correct .
Step-by-step explanation:
The year in which Whataburger expanded to its 100th location is 1980. Whataburger, the popular fast-food chain, experienced a steady growth post its inception in 1950.
The company reached this significant milestone about 30 years after opening its first store. This expansion reflects the brand's success and popularity in the fast-food industry during that time.
Option b is correct .