The evidence of climate-forced sea level rise among the options you provided is submerging of low islands and coastlines.
This phenomenon occurs as the global average sea level rises due to factors such as the melting of ice sheets and glaciers, as well as the thermal expansion of seawater as it warms. Submergence of low-lying islands and coastal areas is a direct consequence of this rising sea level, providing tangible evidence of the impacts of climate change.
The other options (decreased ocean temperatures, changes in surface currents, and increased carbon dioxide in the atmosphere) may be related to climate change in different ways but do not specifically indicate sea level rise.