[单选题]
Two point charges, initi.w16tqgaf7 mlsj*5 a1e7 7rugltj e f6ally 2.0 cm it,ax6 7(9e n03k pcmhnktav9apart, experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what in9(3ptk6e9 th,ia k n0cvx7ams the electric force between them?
A. $4.0 \; N$
B. $16 \; N$
C. $1/4 \; N$
D. $1/16 \; N$