How is the campaign influence for opportunities impacted when a contact is associated to an opportunity in a contact role, if the influence timeframe for a campaign is 60 days?

How is the campaign influence for opportunities impacted when a contact is associated to an opportunity in a contact role, if the influence timeframe for a campaign is 60 days?
A . All campaigns created within the last 60 days will be added to the campaign influence related list.
B . Sales reps can choose which campaigns created within the last 60 days should be added to the campaign influence related list.
C . All contacts associated with campaigns will be added to the campaign influence related list.
D . Campaigns in which a contact became a member within the last 60 days will be associated and
displayed in Campaigns with Influenced Opportunities Report.

Answer: D