Conclusion: MARRIAGE causes GOOD HEALTH.
The assumption is WHAT MUST BE TRUE for this conclusion to be valid.
Apply the NEGATION TEST.
When the correct answer choice is negated, the conclusion will be invalidated. Choice D, negated:
Single people with health problems are LESS LIKELY TO GET MARRIED than are other single people.
Implication:
ONLY HEALTHY PEOPLE are likely to get married.
The negation of D invalidates the conclusion: if most married people were healthy BEFORE they got married,
...
The assumption is WHAT MUST BE TRUE for this conclusion to be valid.
Apply the NEGATION TEST.
When the correct answer choice is negated, the conclusion will be invalidated. Choice D, negated:
Single people with health problems are LESS LIKELY TO GET MARRIED than are other single people.
Implication:
ONLY HEALTHY PEOPLE are likely to get married.
The negation of D invalidates the conclusion: if most married people were healthy BEFORE they got married,
...
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