increasing order of atomic radii of the elements B, Al, C, Si, is

a- si, al, c, b

b- B, C, Al,Si,

c- Al, Si, B, C

D- C, B, Si, Al

The correct order of atomic radius of the elements in the question are :
D )  C<B<Si<Al

This is because atomic radius increases down the group thus Si and Al have larger atomic radius than C and B.
Since atomic radius of elements decreases along a period thus Al will have a larger radius than Si and similarly B ill have larger radius than C.Thus overall increasing order of the atomic radius would be :
C<B<Si<Al
 

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