The answer is c.) He wants Jim to keep a journal on it.
"He said that would do. And that gave him another idea, and he says:
“Borrow a shirt, too.”
“What do we want of a shirt, Tom?”
“Want it for Jim to keep a journal on.”
“Journal your granny—Jim can’t write.”
“S’pose he can’t write—he can make marks on the shirt, can’t he, if we make him a pen out of an old pewter spoon or a piece of an old iron barrel-hoop?”
“Why, Tom, we can pull a feather out of a goose and make him a better one; and quicker, too.” "
