What does the term "ocular" pertain to?

The term "ocular" refers to anything related to the eyes. Therefore, options A, B, and D are incorrect. A nymph is a mythological creature and has no relation to the eyes. OSHA, Occupational Safety and Health Administration, specifically deals with health and safety in the workplace, so it is not related to the eyes. An oncogen is a gene that can cause cancer, which also does not pertain to the eyes. Therefore, the only accurate answer is C, ocular.