The Research Finding That Smokers Were Less Likely to Develop

Multiple Choice

The research finding that smokers were less likely to develop Alzheimer's disease is generally interpreted to mean that

A) research findings are sometimes in error.
B) nicotine protects against dementia for most people.
C) smoking may be helpful in protecting people at high risk for Alzheimer's.
D) smoking may shorten the lives of smokers so that they do not live long enough to develop dementia.