This is a one-to-many relationship: a single subscriber ' s session ID can correspond to multiple abandoned cart line items in the second data extension. LookupRows() is purpose-built for exactly this case — it returns every matching row from a target Data Extension as a rowset, which can then be iterated with a loop (for example, using RowCount() and Field()) to render each product ' s SKU, name, quantity, price, and image inline in the email. Lookup() (option C), by contrast, returns only a single value from the first matching row, making it structurally incapable of listing multiple cart items. Dynamic Content Block and Enhanced Dynamic Content Block (options A and B) are content-personalization tools driven by rule-based conditions tied to subscriber attributes; they display one of several pre-built content variations rather than iterating over an arbitrary, variable-length list of related records. For abandoned-cart, order-confirmation, or any ' header plus line items ' email pattern, LookupRows combined with a loop is the standard AMPscript approach taught across Salesforce ' s own certification content. Reference: AMPscript Data Extension Functions — LookupRows(), Abandoned Cart Journey patterns.