A tractor operated 9-row precision planter has 16 cells on the metering plates. The speed ratio of the metering plates to the ground drive wheel is 1: 2 and the rolling diameter of the ground drive wheel is $40 \mathrm{~cm}$. Assuming no skid, the plant to plant spacing in rows in $\mathrm{mm}$ is

(A) 39

(B) 50

(C) 157

(D) 314

A tractor operated 9-row precision planter has 16 cells on the metering plates. The speed ratio of the metering plates to the ground drive wheel is 1: 2 and the rolling diameter of the ground drive wheel is $40 \mathrm{~cm}$. Assuming no skid, the plant to plant spacing in rows in $\mathrm{mm}$ is

(A) 39

(B) 50

(C) 157

(D) 314

127