[单选题]
A spring with a spring constant of 15 N/m is initially coq)oo4(nwd bh 4mpressed by 3 lcj8oa7(g 8tj.0 cm. How much work is required to compre(co lgjt8j78ass the spring an additional 4.0 cm?
A. $0.0068 \; J$
B. $0.012 \; J$
C. $0.024 \; J$
D. $0.030 \; J$