How should this metric be calculated?

An Einstein Consultant receives a request from the Marketing department to help them understand lead conversion. Presently, they are unaware of the percentage of leads that get converted to sales. They hope to view results by account manager, value, and quarter. The data is there, so the consultant can add it to the marketing dashboard.

How should this metric be calculated?
A . Create a new step in the dashboard using a compare table and define a formula.
B . Create a formula field on the lead object in Salesforce and add it to the dataset.
C . Create a computeExpression in the dataflow.
D . Create a new step in the dashboard using a compare table and the running total function.

Answer: C