The correct answer to the question is option 4, "All of the above." Global warming is expected to result in multiple impacts, including an increase in sea levels, changes in crop patterns, and changes in coastlines.

Firstly, global warming is causing the polar ice caps to melt, leading to a rise in sea levels. This can result in coastal flooding and displacement of people living in low-lying areas.

Secondly, changes in temperature and precipitation patterns due to global warming can affect the suitability of certain regions for agriculture. This can lead to shifts in crop patterns, as some areas may become less suitable for growing certain crops while others may become more favorable.

Lastly, a rise in sea levels and increased storms can also impact coastlines, leading to erosion, loss of land, and changes in coastal ecosystems.

Overall, global warming is a complex issue with various interconnected impacts, and it is expected to have far-reaching consequences on sea levels, crop patterns, and coastlines.