Define cross-channel attribution and mention a challenge.

• A. Reach Is The Number Of Unique Individuals Exposed At Least Once; Frequency Is The Frequency Cap Used to Limit Exposures.
• B. Assigning Value Across Multiple Channels to the Same Customer Journey; Challenge: Data Fragmentation and Model Complexity.
• C. Measuring Only the Last-Click Effect; Challenge: Ignoring Upper Funnel.
• D. Tracking Only TV and Print; Challenge: Limited Digital Data.

Answer: (B)

Cross-channel attribution is the practice of assigning value to multiple marketing channels that contribute to the same customer journey, rather than giving all credit to a single touchpoint. This approach reflects how a consumer may encounter a brand across ads, emails, social posts, and website interactions before converting, and it helps marketers understand the true impact of each channel. The challenge often lies in data fragmentation and model complexity: data about a customer’s interactions sits in separate systems with different identifiers, making it hard to piece together a complete journey; and deciding how to allocate credit across those touches—whether linear, time-decay, or algorithmic—adds complexity and requires robust measurement infrastructure. Other options describe single-channel metrics or last-click attribution, which don’t capture the full multi-touch journey.