Answer:
A) straight rebuy
Explanation:
Based on the information provided within the question it can be said that this type of purchase is classified as a straight rebuy. Like mentioned in the question this is a type of purchasing or reordering of supplies , and is done from an approved list held by the company in order to try and maintain the product's quality (since they already know the approved company sells good quality) as well as save time on having to research other suppliers.