Option is the "odd one out" because multicellular rhizoids and a prominent protonema stage are characteristic features of mosses, not liverworts.

Rhizoids: In liverworts, rhizoids are typically unicellular. In contrast, mosses possess multicellular rhizoids with oblique septa.

Protonema: While a highly reduced "sporeling" stage exists in some liverworts, the distinct, creeping, filamentous, and branched protonema stage is the primary juvenile phase specifically associated with the life cycle of mosses