Possible long-term consequences of the "greenhouse effect," the gradual warming of the Earth's climate, may include melting the polar ice caps and a rising sea level.

• Amay include melting the polar ice caps and a rising sea level  
• Bmay include the melting of polar ice caps and the rising sea level  
• Cmay include polar ice caps that are melting and sea levels that are rising  
• Dinclude melting the polar ice caps and sea levels that are rising  
• Einclude melting of the polar ice caps and a rise in sea level