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At what height from the ground will the value of 'g' be the same as that in 10 km deep mine below the surface of earth

$(a)\;20\;km \quad (b)\;10\;km \quad (c)\;15\;km \quad (d)\;5\;km$

Same changes in value of $'g'$ can be observed at a depth $'x'$ and height $'2x'$
given that the depth $'d'=x=10 km$
$\therefore$ The same change can be observed at a height $2x=20 \;km$
Hence a is the correct answer
edited Jul 2, 2014