The correct answer is C) Da polyps receive shelter from da algae.
This relationship is commonly seen in coral reefs, where coral polyps (which are small marine animals) live in a symbiotic relationship with algae called zooxanthellae. The algae provide the polyps with shelter and perform photosynthesis, producing oxygen and organic compounds that benefit the polyps. In return, the polyps offer the algae a protected environment and access to sunlight.