[单选题]
A mass oscillates on the end 1-xf.q( t/jlg5b-.qpr(mxx a w(qiy i of a spring, pw;)mft/(i nxboth on Earth and on the Moon. Where is the period txtm(i) nwp/ f;he greatest?
A. Earth
B. the Moon
C. same on both Earth and the Moon
D. cannot be determined from the information given
