It can be inferred from the passage that, if a large male sea otter weighs 100 pounds, it must eat approximately ______ of food a day to maintain its body heat.

A．It has been growing at too fast a rate.
B．Its growth rate has been steadily decreasing.
C．Its growth rate is not as fast as that of the Alaska sea otters.
D．It has been greatly reduced by oil spills and other forms of pollution.

A．He was a doctor working in a city.
B．He was a doctor working in the country.
C．He was an artist working in Dublin.
D．He was an artist working outside Dublin.