What best explains the term greenhouse effect? 

A)  The greenhouse effect refers to the occupational diseases of florists. 
B)  The greenhouse effect refers to the trapping of heat energy in the troposphere by certain gaseous molecules. 
C)  The greenhouse effect refers to the efforts by the White House to support environmental legislation. 
D)  The greenhouse effect refers to the trapping of heat energy in the stratosphere by nitrogen.

The greenhouse effect refers to the trapping of heat energy in the troposphere by certain gaseous molecules. These molecules, including carbon dioxide and methane, act like the glass walls of a greenhouse, allowing sunlight to enter but trapping heat inside. This effect helps to regulate the Earth's temperature and keep it within a range that is suitable for life. However, human activities such as burning fossil fuels and deforestation have increased the levels of greenhouse gases, leading to an enhanced greenhouse effect and global warming.