Answer:
The correct answer is d. only if it is in writing.
Step-by-step explanation:
The promise of sale is a contract that contains reciprocal obligations for the parties, each one must comply with what it has been forced to give or do, and if one of the parties fails to comply, it enables the other party to pursue the fulfillment of what was promised. , or to demand payment of the penal clause, compensation for damages, etc.