Multiply $\large\frac{14}{25}\times \large\frac{35}{68}\times \large\frac{34}{49}$

Question

( A )$\large\frac{1}{3}$
( B ) $\large\frac{1}{2}$
( C ) $\large\frac{1}{8}$
( D ) $\large\frac{1}{5}$