[单选题]
Two displacement vectors have s7 ka-i66q1n+0 oo2v gpggtqg86xwgtap uy-yvk k *//e.xei8magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors v twu/x/ xygyek68 .kp*i- e8aare added, the magnitude of the sum
A. is 2.0 m.
B. could be as small as 2.0 m, or as large as 12 m.
C. is 12 m.
D. is larger than 12 m.
