In double lacing, the thickness 't' of flat lacing is

A

t is les s than $$\frac{1}{40^{th}}$$ length between inner end rivets

B

t is less than $$\frac{1}{50^{th}}$$ length between inner end rivets

C

t is less than $$\frac{1}{60^{th}}$$ length between inner end rivets

D

t is less than $$\frac{1}{70^{th}}$$ length between inner end rivets