Based on the context of this sentence, what is the best meaning for the word ruefully?

Read the passage below and answer the question, dill was a curiosity. in the excerpt above, the word "curiosity" suggests that dill is odd dill asks a lot of questions dill is hard to understand dill is lost

Which sentence uses all its nominative case pronouns correctly? a we live on the same street b them and rachel are good skaters. c the redskins fans in the family are fred and me d have joanne and him played tennis together before?

What is the italicized part in the sentence , all of the operators are efficient.