Ciliary muscle while reading a book and while driving.
A
flattens
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B
expands
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C
contracts
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D
weakens
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Solution
The correct option is C contracts Ciliary muscles contract to make the eyelens thicker which reduces the focal length and thus enables us to see nearby objects (eg: while reading a book). It expand/relax to make the eyelens thinner and thereby increasing its focal length to enable us to see far off objects (eg: while driving).