• A research article states that there is moderate positive relation between gait speed and cognition in older adults (r=0.60,p<0.05). This indicates that:
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• a. As age increases, people walk more slowly and their cognitive abilities decline 
• b. As cognition declines, gait speed increases 
• c. Walking slowly may cause poor cognitive abilities 
• d. As gait speed declines, cognition may also decline in older adults