Answer:D. convergent evolution
Step-by-step explanation:
Cacti or cactuses are member of the plant family and are often referred to as spiny plants that are usually found in the desserts.
Evolution - In biology, is described the ascent or descent in the characteristics of a species over a series of generations
and natural selection favors its modification.
When two species populations evolve to become more similar to each other we say say they have a convergence evolution.
Hint: Evolution of analogous structures is always an example of convergent evolution.