A thin metal rod expands $1\mathrm{.}1$ mm when its temperature is increased by $2\mathrm{.}0C.$ If an identical rod of the same material, except fourfold as long, also has its temperature increased by $2\mathrm{.}0C,$ it will expand

$4\mathrm{.}4$ mm $.$

$8\mathrm{.}8$ mm $.$

$0\mathrm{.}28$ mm $.$

$1\mathrm{.}1$ mm $.$

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