The pair that has similar atomic radii is:

Step-by-step solution

Among the given pairs Mo and W have the same atomic radius of 139   p m and this is due to Lanthanoid contraction. This happens due to the poor screening ability of 4f electrons. The radius of other pairs are: S c   ( 162   p m )   a n d   N i   ( 124   p m ) M o   ( 139   p m )   a n d   W   ( 139   p m ) M n   140   p m a n d   R e   135   p m T i 170   p m   a n d   H f   159   p m .