The UCL and LCL for an overbar$($x$)$ chart are $50$ and $40$ respectively. The central line is $45,$ and the process variability is considered to be in statistical control. The results of the next six sample means are $48,43,47,41,54,$ and $46.$ What should you do$?$

Question $12$ options:

A$)$

Explore the assignable causes because there is a trend.

B$)$

Explore the assignable causes because at least one of the sample means is outside the control limits$.$

C$)$

Explore the assignable causes because there is a run.

D$)$

Nothing; the process is in control.