Objective: how can i make bread crumbs?

Which of the following solutions is more sound in terms of naive physics reasoning?

Options are:
[A]. Preheat oven to 250 degrees F (120 degrees C). Using tinsel, place bread slices directly on oven racks. Leave in oven until hard and golden brown, about 30 minutes; darker if you prefer. ... Crumble slices into a large bowl until reduced to fine crumbs, or place in bowl of food processor and process until fine..
[B]. Preheat oven to 250 degrees F (120 degrees C). Using tongs, place bread slices directly on oven racks. Leave in oven until hard and golden brown, about 30 minutes; darker if you prefer. ... Crumble slices into a large bowl until reduced to fine crumbs, or place in bowl of food processor and process until fine..
[B].