[求助]一道数学。？？？

xh33

if x is in the line, then -x is in the line. is 12 in the line?
I. -2 is in the line
II. -3 is in the line
ans: C

？？？

lisaislisa

i am wondering ....
what means in the line ?...
now i am thinking about the answer E

^^

猫猫头

题目对吗？？