PLZ HELP!!! I'm timed. I need answer as soon as possible. Will mark the brainliest if correct and ad a thanks with a rate of 5 too. thank you :) .
Which definition best describes global warming?

a long-term change in the Earth's climate
a long-term increase in the Earth's average temperature
a long-term change in the climate of a region or a city
solar heat that is radiated out into space