The correct option is Convergent evolution.

What are Analogous Structures?
Analogous structures are biological features found in different species that perform similar functions and often look similar, but do not share a common evolutionary origin or anatomical blueprint. A classic example is the wings of a butterfly (an insect) and the wings of a bird. While both structures are adapted for flight, their internal anatomy, tissue composition, and embryonic development are completely different.

How Convergent Evolution Leads to Analogous Structures:
Convergent evolution is the evolutionary process where organisms that are not closely related independently evolve similar traits, behaviors, or structures. This convergence occurs because the different species inhabit similar environments or face similar ecological challenges and selective pressures. Over time, natural selection favors similar adaptations in these unrelated lines, resulting in analogous structures.

Why the other options are incorrect:
• Divergent evolution: This occurs when closely related species accumulate differences over time, often due to adapting to different environments or niches. Divergent evolution results in homologous structures, which share a common anatomical origin but may perform different functions (for example, the forelimbs of humans, cats, and bats).
• Parallel evolution: This describes a situation where two independent species evolve similar characteristics while living in similar environments, but they do so because they share a relatively recent common ancestor and similar genetic starting points.
• Retrogressive evolution: This refers to a type of evolutionary change where an organism simplifies or loses complex structures over time (for example, the loss of limbs in ancestral snakes or the loss of digestive systems in tapeworms).