Answer: C. sequence structure
Step-by-step explanation:
Catherine would use the sequence structure to achieve her results of powdered herb after pounding the herbs.
In a sequence structure, an action, or event, tends to lead to the next action in an order which has been predetermined. The sequence can contain any number of actions, but no actions can or must be skipped in the sequence.
This means she has to go through the pounding process to achieve the powdered state.