Plants and animals are NOT a focus of Realism. Option A is correct.
The artist movemen which was named as realism originated in France in the 1840s, around the 1848 Revolution.
Realist works portrays people of all classes in situations that occur in ordinary life, and often depicted the changes brought by the Industrial and Commercial Revolutions.
Realism mainly focused on how things appeared to the eye, rather than containing ideal representations of the world.