Answer: 2)Fishbone/lshikawa
Step-by-step explanation: Fishbone diagrams are those diagrams which help in the identification of the problem causing factors and reasons behind.This diagrams find the roots of the problem to solve it. Fishbone diagram is also known as the Ishikawa diagram.
The other given options are incorrect because they are not any technique for finding the roots of the problem.Thus, the correct option is option(2).