These promotions may be adding the option to more customers, such as the free Burger size, or to buy 1 get 1 free, etc. This is to encourage customers to have more attention.
The promotion may provide more options to customers, such as the up-sized burgers, buy 1 get 1 free or, when necessary, to encourage customers to do even more.
The promotion, this may be an added option to more customers, such as making เบอร์เกอร์ฟรี size or purchase 1 and 1 etc. In order to encourage customers to have interest more and more.