Answer:
B. Batch-level activity
Explanation:
A purchase order is is document issued by a seller to a buyer that indicates types, quantities, and agreed prices of products to be delivered. It is used to discourage purchase of product from other users.
Purchase order is a legally binding document. It provides a better way to keep track of inventory and payment for goods and services.
It is a batch level activity because it involves sale of large batches of products.