The reader can infer answer A). "Della was so excited to have the combs she had wanted that she momentarily forgets she had cut her hair."
You can find the reasons for that answer in words such as: <em>scream of joy, feminine change to hysterical tears and wails. </em>First, she was happy but then she remembers she won´t be able to use the combs.
The definition of time as something that passes and is centred in the now is contained implicitly in the use of the tenses ... Clocks do not measure the passage of time but translate temporal intervals into spatial structures.