Answer:
c. octopus
Step-by-step explanation:
Mermaids, dolphins, and shrimp do not have three hearts.
- Mermaids are mythical creatures
- Dolphins have one heart
- Shrimp have five hearts.
Only octopuses have three hearts.

The two smaller hearts of an octopus pump blood to its gills, while the larger heart pumps blood to the rest of its body. This system of three hearts allows octopuses to swim quickly and efficiently, even in the cold water of the deep ocean.