To answer the question, the user needs to know the basic concepts of IMS, including the different interfaces used to connect the program to the Database in IMS.

Each option is explained below:

A. MPP: This option stands for Message Processing Program, which is not the correct interface used to connect the program to the Database in IMS.

B. ACB: This option stands for Access Control Block, which is not the correct interface used to connect the program to the Database in IMS.

C. DLI: This option stands for Data Language Interface, which is the correct interface used to connect the program to the Database in IMS. It provides a high-level interface for accessing IMS databases.

D. BMP: This option stands for Batch Message Processing, which is not the correct interface used to connect the program to the Database in IMS.

Therefore, the answer is: C. DLI