[单选题]
A lever is 5.0 m long. T dl :vf7rvd)4rhe distance from thxle t+ ns3t-u,e fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the te,3x ts uln+-maximum weight that can be lifted?
A. $80 \; N$
B. $100 \; N$
C. $1600 \; N$
D. $2000 \; N$
