Final answer:
The stem adaptation among the listed options is stolons. Unlike root adaptations, stolons help in asexual reproduction and storage for plants such as strawberries.
Step-by-step explanation:
The stem adaptation in question is b) stolons. Stem adaptations such as rhizomes, stolons, and runners provide many advantages to plants, such as enabling asexual reproduction and allowing plants to disperse and colonize new areas efficiently.
Tubers, like those of a potato, are also modified stems that primarily serve as storage organs for starch and facilitate vegetative reproduction. Contrary to these, root adaptations primarily provide support and absorb nutrients and water from the soil.