What does the underlined sentence 'She is at a loss to explain it' mean?
A.
In her opinion it was a loss to the clothes shops where she stole things.
B.
She doesn't have any idea why she has the desire to steal from shops.
C.
She thinks it is a loss for her to explain why she stole things from shops.
D.
Personally she feels ashamed and embarrassed for her shoplifting actions.