Final answer:
2. Context, captions, and description provide complementary information that helps the reader understand what is happening in a photo.
Step-by-step explanation:
2. Context is the complementary information that is not seen in the photo but helps the reader understand what is happening. It provides a background or setting for the photo, allowing the reader to make connections and interpretations.
Captions also provide additional context by giving a short description or explanation of the photo. Lastly, Description can help the reader understand the details and elements of the photo that may not be immediately evident.