According to the chart answer must be a
Out of the choices given, one adaptation that is unique to marine mammals is they can slow their own heartbeat down.
This jet stream—the one that forms at the polar front—affects weather in the United States. ... This shift occurs because the entire hemisphere is cooler, so the boundary between the cold polar air and the warm southern air shifts south. As a result, the jet stream shifts toward the south in winter.
I think it’s C but not precisely sure about it