Alice Manages Several AdWords Accounts and She Has Three Assistants

Multiple Choice

Alice manages several AdWords accounts and she has three assistants who help with the management of the accounts. Alice receives a phone call from one of her clients regarding recent Google AdWords clicks. The client reports that he thinks something is amiss with his account, and thinks someone has changed the budget. How can Alice review any changes to the account and, if necessary, determine if someone has made changes to the account's budget?

A) Alice should use the AdWords Editor.
B) Alice should use the AdWords API.
C) Alice should use the Change History Tool.
D) Alice should use the My Client Center.