What is a field guide primarily used for?

A field guide is primarily a tool designed to help individuals identify various elements of the natural world, such as birds, plants, insects, and other wildlife. These guides typically include illustrations or photographs and descriptive information about characteristics, habitats, and behaviors, making it easier for users to recognize and learn about different species in their natural surroundings. The focus of a field guide is practical observation and identification, particularly in settings like forests, wetlands, or parks, where users can apply their learning in real-time. This makes option C the most accurate choice, as it reflects the main purpose of a field guide.

In contrast, identifying characters in a story pertains more to literary analysis rather than nature, while summaries of literary works focus on presenting the essential points of a narrative instead of providing identification tools. Facilitating language learning is also unrelated, as field guides do not serve to teach language skills directly; rather, they present factual information about nature.