Based on the information provided, determine the context of evolution.

Despite having feathers, some dinosaurs were unable to fly. Birds can fly because they have feathers. Which of the following statements correctly describes the evolutionary relationship between reptiles and birds?

The presence of feathers in certain dinosaurs and birds, and the ability of birds to fly, suggest an evolutionary relationship between reptiles and birds. Therefore, the statement "Birds have evolved from reptiles" is the correct answer. The missing link between reptiles and birds is the dinosaur with feathers named Archaeopteryx sp., which is considered a transitional species between reptiles and birds.

"Reptiles evolved from birds" is incorrect because birds evolved from reptiles, not the other way around. 

"No evolutionary links exist between reptiles and birds" is also incorrect because reptiles and birds have evolutionary links through their shared ancestry. 

"Feathers are homologous structures in both the groups" is partially correct, but it does not fully describe the evolutionary relationship between reptiles and birds. While feathers are homologous structures in both reptiles and birds, it is their shared ancestry that establishes the evolutionary connection between these groups.