Option 1 states that both statements are individually true and that Statement II is the correct explanation of Statement I. Let`s examine each statement to see if this is accurate.

Statement I states that global warming signifies the rise in global surface temperature. This is true as global warming refers to the long-term increase in average global temperatures.

Statement II states that the increase of greenhouse gases in the atmosphere causes the rise in global surface temperature. This is also true, as greenhouse gases like carbon dioxide trap heat in the atmosphere, leading to a warming effect.

Therefore, both statements are individually true. Additionally, Statement II serves as the correct explanation of Statement I because it explains the cause-and-effect relationship between greenhouse gases and global surface temperature increase.

Option 1 is the correct answer as it accurately reflects the truth of the statements.