You have a maximum cost-per-click (max. CPC) bid of US$2 for a keyword. To determine the prospective impact of raising this bid to US$3, you could use:
The correct answer is:
The regular Bid Simulators show you how changes to your max. CPC bid might change the cost or the number of clicks, impressions, conversions, and conversion value your ads would have received for your keyword or ad group. You can find them on the Ad groups and Keywords tabs.
Read more here: https://support.google.com/adwords/answer/2470105?hl=en