Read the following scenario and answer the question that follows:

Karel and Martie entered into an agreement with New Visions Kitchens to renovate their kitchen. They agreed that New Visions Kitchens would replace their old stove with a new Easycook stove. The new stove would have a two-year guarantee. Karel and Martie could not wait to try out the new stove and invited their best friends for dinner. To their utter disappointment and anger, the oven failed before the meal was cooked. They had to go to a restaurant for dinner instead. The following day Karel's brother, who repairs electrical appliances, looked at the stove and told him that it was not a new stove. When Karel phoned New Visions Kitchens, they refused to speak to him.

Which division of the private law will be applicable to the agreement of replacing the old stove with a new stove?