The correct option is C Earthquakes
Global warming is basically an increase in the average global surface temperature.
Oceans absorb more heat than land, causing an increase in the average ocean temperatures on the planet. This adversely affects aquatic life, particularly, sensitive marine ecosystems such as coral reefs.
Excessive melting of ice caps can reduce the weight borne by land, which can cause earthquakes or volcanic eruptions by causing a disturbance in the continental plates and/or the magma under them.
Melting of ice caps can also increase the volume of oceans and can result in tsunamis and volcanic eruptions.