Conversion Tracking helps you improve the return on investment (ROI) from your online advertising because it:

Conversion Tracking helps you improve the return on investment (ROI) from your online advertising because it:

• measures trends relating to the search terms people have used before seeing your ad
• focuses on getting customers to complete an online purchase
• shows you which ads lead to customer actions that have value for your business
• automatically gives you personal details about the people who convert

Correct answer is:

• shows you which ads lead to customer actions that have value for your business

Explanation: Conversion tracking shows you which ads lead to customer actions that have value for your business. It helps you improve the return on investment (ROI) from your online advertising.

Conversion tracking is a free tool that shows you what happens after a customer clicks on your ads — whether they purchased a product, signed up for your newsletter, called your business, or downloaded your app. When a customer completes an action that you’ve defined as valuable, these customer actions are called conversions.

Read more here: https://support.google.com/adwords/answer/1722022?hl=en