Which of the following can be used as the required diene in a Diels-Alder reaction? 
Definitions:
Behavioral Risk Factors
Characteristics or behaviors that increase the likelihood of developing a disease or injury.
Cardiovascular Disease
A class of diseases that involve the heart or blood vessels, leading to conditions like heart attacks or strokes.
Lifestyle Changes
Modifications to daily habits and routines, such as diet and exercise, aimed at improving overall health.
Industrialized Nations
Countries that have undergone industrialization, exhibiting significant technological advancement, economic development, and a higher standard of living.
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