(c) seeds
Plants like rose and banana have lost the capacity to produce seeds, so they are propagated vegetatively.
Source: Vegetative Propagation, Chapter 7
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The passage explicitly states: "such methods also make possible the propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds." This is a direct recall question — just identify the correct word from that line. Do not confuse with flowers or fruits, which these plants still produce normally.