How might an advertiser compare, over time, two campaign metrics such as “cost per conversion” and “cost”?

How might an advertiser compare, over time, two campaign metrics such as “cost per conversion” and “cost”?

A) Run an impression share report and select to display the two metrics
B) Filter all keywords with an average position greater than three
C) Select the two metrics in “Graph options” on the Campaigns tab. 
D) Search the account for keywords with high average cost-per-click (CPC) bids.