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Correct option is

$λ2Nh =MV_{(meanposition)}$

$V_{(meanposition)}=ΩA$ (where $A=1μM$)

$λ2Nh =MΩA$ (where $λ=8π×10_{−6}$)

$N=2hMΩ(10_{−6})λ =2hMΩ8π×10_{−6}×10_{−6} $

$N=h4πMΩ ×10_{−12}$

$=10_{24}×10_{−12}$

$N=1×10_{12}$

$x=1$

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