Final answer:
The Leads by Source Report in Marketo allows you to compare the lead generating and opportunity creation performance of different lead sources.
Step-by-step explanation:
The Leads by Source Report in Marketo can be used to D. Compare the lead generating and opportunity creation performance of your lead sources. This report provides insights into the effectiveness of different lead sources in generating leads and creating opportunities. It allows you to analyze which sources are performing well and which ones need improvement. By comparing the performance metrics of different lead sources, you can make data-driven decisions to optimize your lead generation strategies.