Answer:
D. spine
Step-by-step explanation:
Many do not know, but the knife has a kind of "anatomy" where every bit has a specific name and function.
When it is necessary to use a knife on a sturdy vegetable such as yam, it is not recommended that the knife blade be used as this would cause a lot of work to break the yam into pieces and could bend the knife. Ideally hit the yam with the part of the knife called the "spine".
The spine is the thickest part of the blade normally opposite the cutting edge. This part influences the resistance of the blade, causing a strong impact when used to strike a resistant object, in this case the yam.