While reviewing the data feeds on a project the business analyst (BA) realizes there is...

A data model is a graphical or textual representation of the data and their relationships within a domain or a solution. It can help to understand the data and accurately reflect a set of requirements by showing the entities, attributes, keys, constraints, and associations that define the data structure and meaning. A data model can also help to prioritize the requirements by identifying the critical and dependent data elements and their impacts on the solution. The other options are not the best modeling formats for this purpose, as they either do not show the data relationships, or do not support prioritization. References:

CBAP / CCBA Certified Business Analysis Study Guide, 2nd Edition, Chapter 6: Requirements Analysis and Design Definition, Section 6.4: Model and Validate Requirements, p. 261-262

A Guide to the Business Analysis Body of Knowledge® (BABOK® Guide), Version 3, Chapter 6: Requirements Analysis and Design Definition, Section 6.4: Model Requirements, p. 157-158