[单选题]
A force moves an object in zeqy;s g,vaqt ,px51)za1 3i qthe dgq,dn, b+foj4 irection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves f 4o,ndbj,+qf grom 0 to 2.0 m.
A. $20 \; J$
B. $40 \; J$
C. $60 \; J$
D. $80 \; J$
