She was so touched by the generosity that she was _____ for words.

1. A.
   in loss
2. B.
   in a loss
3. C.
   at loss
4. D.
   at a loss

She was so touched by the generosity that she was _____ for words.

[　　]

A．in loss　　　　　　B．in a loss

C．at loss　　　　　　D．at a loss