Product Groups Are Eligible For The Bid Simulator:

When Shopping ads have been included in enough auctions or accrued enough impressions
Once the average cost-per-click (avg. CPC) is close to the maximum cost-per-click(max. CPC) bid
Anytime after a product group is created in a Shopping campaign
Once a budget cap has been reached for a product group

The correct answer is:

When Shopping ads have been included in enough auctions or accrued enough impressions

Sources: Google Shopping Ads Certification Course

To see all the questions and correct answers of the Google Shopping Ads Certification Exam, Click Here – Google Shopping Ads Certification Answers.