Which sentence has a pronoun-antecedent error? a) the husband and wife had a long argument over their plans for next month's budget. b) each of the women brought her best dessert to the church fellowship on sunday night. c) before the book could be replaced, the librarian had to do research on its current cost. d) all of the students going on the field trip must pay his own way by the end of february.

However, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. what would be the best way to revise this sentence for greater clarity? a) however, the fact that columbus left spain thousands of years after people settled what would become the united states never dawned on me. b) it never dawned on me, however, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain. c) however, the fact that people were already living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. d) however, the idea never dawned on me that long before columbus ever left spain, real-life people lived for thousands of years in what would become the united states.