[单选题]
A force moves an object in ryx7 ;d5l o/p ax kaqat:d y;34/ybcr-the direction tk,sltkff/:y -b21hw of the force. The graph in Fig. 6-1 shows the force versus the object's pbftythsk 1w2 -k:l/,fosition. Find the work done when the object moves from 0 to 2.0 m.
A. $20 \; J$
B. $40 \; J$
C. $60 \; J$
D. $80 \; J$
