Mahesh, a class IV teacher, plans to sensitize students to the concept of ‘conversation of trees’

Mahesh, a class IV teacher, plans to sensitize students to the concept of ‘conversation of trees’ which one of the following activities is most suited for this purpose?
(a) Conducting a debate competition
(b) Motivation each student to adopt and nurture one tree
(c) Encouraging students to participate in postern completion
(d) Making teams of students for group discussion