87. Kolb’s experiential learning model is suggested to be used in STEM teaching for not only equipping students with traditional skills in using technology tools but also promoting their level of cognition. As the first step begins with hands-on work providing concrete experience, then the third step is abstraction. The purpose of abstraction is to build up .
(A)hands-on skills
(B)concept
(C)STEM tools, for example, arduino
(D)computing thinking