A process when in control produces a normally distributed output with a mean of $200$ and a mean range of $20.$ When using samples of size $8,$ then which of the following is the upper control limit of the R chart?

A$)38\mathrm{.}5$

B$)40$

C$)26$

D$)34\mathrm{.}3$

E$)37\mathrm{.}3$