In order to infer a theme from a story, one must identify the central and its

central conflict and its resolution

i think the answer is c. she can't feel happy because things are moving too quickly.

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.