Why does mrs. frankweiler think claudia wants to run away?

a.
claudia wants to learn more about new york.

b.
claudia wants some excitement in her life.

c.
claudia wants to ride on the train.

d.
claudia wants to visit an art museum

the anwser is went creeping down the river again, across the wide lonely marshes to the sea.

i longed to go with them out into the world to seek my fortune in foreign lands—africa, india, china and peru!

and, dreaming of the lands i had never seen, i'd sit on there, watching till they were out of sight.