4
Answer: CSet 5: Command of Evidence
Explanation
PASSAGE
Studies show that multitasking reduces productivity. When the brain switches between tasks, it takes time to refocus. What feels like doing two things at once is actually rapid task-switching, and each switch incurs a cognitive cost.
Why is multitasking less efficient than it seems?
A. The brain can handle infinite tasks simultaneously.
B. Task-switching requires time and mental effort, reducing overall efficiency.
C. Multitasking only works for simple tasks.✓ Correct
D. Studies on multitasking are unreliable.
Detailed Explanation
The text says switching 'takes time to refocus' and 'each switch incurs a cognitive cost. ' This reduces efficiency.
Key Evidence:
• "takes time to refocus"
• "cognitive cost"
Why others are wrong: A (The entire text argues the opposite.), C (Not mentioned; the text discusses multitasking generally.), D (The premise says 'studies show,' not that they are unreliable.).