[单选题]
A boy and a girl are balanced on a masslb7 ( gsf rdeedwa+-.0wess seesaw 7p)yr29(j kuoosc. ie. The boy has a mass of 75 kg acsy 7o.ur pe (jk92o)ind the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of the seesaw, where must the girl sit on the other side?
A. $1.3 \; m$
B. $2.3 \; m$
C. $2.5 \; m$
D. $3.0 \; m$
