Answer: B). Stablize the object with cribbing as you go.
Explanation: when leveraging an heavy object to remove a survivor, cribbing and leveraging is used together to stabilize the object, this is done by an alternative lifting of the object and placing crib materials underneath the lifted edge, whilst conducting the rescuing operations it is said that leveraging and cribbing at opposite ends should not be done together because doing that would increase instability of the object.