Hi Tabassum,
As you have done MBA in marketing I will suggest you to go for SAP SD or CRM.
SAP Sales and Distribution help you to manage system configuration, master data, order and cash process transactions. Whereas SAP Customer Relationship Management is known as integrated customer relationship management module by SAP that helps any organization to achieve their business goals and allows them to perform all Customer Relationship tasks efficiently.
Thanks
Ayush Bhardwaj