[单选题]
A 0.200-kg mass attached to th17u;a)ns.gtrb- ich ye ez4sbv:fn 1,)h:a pwcdp9 4zl knd of a spring causes it to stretch 5.0 cm. If another 0.200-kg masva9blzh) 4pn dw,zk:4pfcs 1:s is added to the spring, the potential energy of the spring will be
A. the same.
B. twice as much.
C. 3 times as much.
D. 4 times as much.
