Final answer:
Sudden Infant Death Syndrome (SIDS) refers to the sudden and unexplained death of an otherwise healthy infant, typically while sleeping. It is considered a diagnosis of exclusion, meaning that it is only used when no other cause of death can be identified.
Step-by-step explanation:
The correct answer is: B. died unexpectedly and of an undetermined cause. Sudden Infant Death Syndrome (SIDS) refers to the sudden and unexplained death of an otherwise healthy infant, typically while sleeping. It is considered a diagnosis of exclusion, meaning that it is only used when no other cause of death can be identified.
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