[单项选择]A production process has been defined as part of an industrial equipment manufacturing project.The process is intended to produce steel bolts with a length of 20cm.The control limits are 19.955cm and 20.045cm.The measurements made at the end of the process yielded the following results:20.033cm,19.982cm,19.995cm,20.006cm,19.970cm,19.968cm,19.963cm,19.958cm,19.962cm,19.979cm,19.959cm.What should be done ?() A. The process is tinder contr01.It should not be adjuste B. A special cause should be investigated,the process should be adjuste C. The control limits should be adjuste D. The measuring equipment should be recalibrate