PrepTest 87, Section 3, Question 17
After monitoring blood levels of lycopene (a nutrient found in some fruits and vegetables) in 1,000 middle-aged study participants over a 12-year period, researchers found that participants with low levels of lycopene were more than twice as likely as those with high levels to have a stroke during that period. Clearly, lycopene reduces the risk of stroke.
After monitoring blood levels of lycopene (a nutrient found in some fruits and vegetables) in 1,000 middle-aged study participants over a 12-year period, researchers found that participants with low levels of lycopene were more than twice as likely as those with high levels to have a stroke during that period. Clearly, lycopene reduces the risk of stroke.
After monitoring blood levels of lycopene (a nutrient found in some fruits and vegetables) in 1,000 middle-aged study participants over a 12-year period, researchers found that participants with low levels of lycopene were more than twice as likely as those with high levels to have a stroke during that period. Clearly, lycopene reduces the risk of stroke.
After monitoring blood levels of lycopene (a nutrient found in some fruits and vegetables) in 1,000 middle-aged study participants over a 12-year period, researchers found that participants with low levels of lycopene were more than twice as likely as those with high levels to have a stroke during that period. Clearly, lycopene reduces the risk of stroke.
Which one of the following, if true, most weakens the argument?
Most fruits and vegetables that are rich in lycopene also contain high levels of several other nutrients that are thought likely to reduce the risk of stroke.
Countries in which people consume substantial quantities of lycopene-rich fruits and vegetables generally have lower rates of stroke than other countries.
Middle-aged people typically have lower lycopene levels than young adults.
Study participants with high levels of lycopene consumed, on average, twice the quantity of fruits and vegetables as those with low levels of lycopene.
There was wide variation in lycopene levels among study participants.
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