Concept:Modified storage and reproductive organs that look like roots but are really stem tissues.
Explanation:Corms, rhizomes, and tubers are swollen, fleshy plant parts that grow under the soil.
They store food and enable vegetative propagation.
These structures possess buds, nodes, and scale leaves, which are characteristics of stems, not roots.
Because they are stem in origin yet grow below ground, they are correctly classified as underground stems.
Answer:A. underground stems.