Which Characteristics Pertain to the Problem of Global Warming

Which characteristics pertain to the problem of global warming?
I.Possible consequences include altered climate and increased sea level.
II.Heat energy radiated by the earth is captured by atmospheric molecules.
III.Increased skin cancer incidence and damage to radiation sensitive species has been observed.
IV.The concentration of stratospheric ozone is declining.

A) I and II only
B) I and III only
C) II and IV only
D) III and IV only