A 71-kg adult sits at one end of a 9.2 -m-long board. His 26-kg child sits on the other end, Part A Where should the pivot be placed so that the board is balanced, ignoring the board's mass?
A) 2.7 m from the adult
B) 3.4 m from the adult
C) 4.1 m from the adult
D) 4.8 m from the adult