Adjustments made to the daily budget can be found in Change History tool

Information an advertiser would find in the Change History tool would be:

• Credit card information associated with the account.
• Adjustments made to the daily budget.
• Timestamps for when ads were approved or disapproved.
• Changes made by the Ad Automator feature.

The correct answer is:

• Adjustments made to the daily budget.

Explanation: You can view all changes for a particular time period, filter the results by the type of change (such as budget adjustments or keyword edits), or see changes for a particular campaign or ad group.

You can read more here: https://support.google.com/partners/answer/19888?hl=en