Answer:
The correct answer is the option A: because it is a promise of something of value.
Step-by-step explanation:
To begin with, in order to understand that the discount is legally sufficient consideration it is necessary to understand that it is due to the fact that what the company is offering is something of value for them, therefore that they decide to offer it to the other business in order to make an agreement according to the situation that they are both in. Moreover, that promise is consider to be legitim in court if it was stated in a written way in where both parties agree to the terms of use.