[单选题]
A mass is hung from identicalc,v,,,vm jebpeh vl79 0 yrfpl+i(c w9 w.,v..vp a/ buixivk,ruwv 8vi1*b c(eires made of aluminum, brass, copper, and steel. Which w8.ui ivi,vvre c 1w*a(/vpv.b,xuk .b ire will stretch the least?
A. aluminum
B. brass
C. copper
D. steel
E. all the same
