Which of the following pairs of compounds could be used as the basis for a Diels-Alder synthesis of the compound shown below? 
Definitions:
Mortality Rate
A measure of the frequency of occurrence of death in a defined population during a specified interval.
Cohort Death Rate
is a measure of mortality rates within a defined cohort of individuals over a specific period of time, illustrating the rate at which members of the cohort die.
Grandparents
The parents of a person's father or mother – paternal or maternal.
Healthier
A state of improved physical, mental, or social well-being, often as a result of changes in lifestyle, environment, or healthcare.
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