Which method is used to detect rot in manila lines?（） A: Feeling the surface of the line for broken fibers B: Measuring the reduction in circumference of the line C: Observing for the appearance of mildew on the outer surface D: Opening the strands and examining the inner fiber

In order to detect rot in manila lines，you should（）. A: feel the surface of the line for broken fibers B: measure the reduction in circumference of the line C: observe any mildew on the outer surface D: open the strands and examine the inner fiber