Tim’s mum is worried ____ her son’s eyesight as he plays

online games too much.

Tim’s mum is worried _______ her son’s eyesight as he plays online games too much.

Tim’s mum is worried ____ her son’s eyesight as he plays  online games too much

1. A.
   for
2. B.
   about
3. C.
   with
4. D.
   of