The following is a simple method of __ __ __ __ __ __ ? Kindly read the below statement and select the type of analysis.

(The worker fell on the ground in factory and broke his hand, we asked why he fell? they said because there was oil on the ground. We ask why?. The said because the machine keep droping oil on the ground. We ask why?. They said because the spare part is not orginal. We ask why?. They said because the procurement department didn't follow the best procurement practices).

The type of analysis is

1. Sensitivity analysis.

2. Markov analysis.

3. Root cause analysis.

4. Least square analysis.