Which issue will an architect have when implementing this in Salesforce?

Ursa Major Solar’s legacy system has a quarterly accounts receivable report that compiles data from the following:

– Accounts

– Contacts

– Opportunities

– Orders

– Order Line Items

Which issue will an architect have when implementing this in Salesforce?
A . Custom report types CANNOT contain Opportunity data.
B . Salesforce does NOT support Orders or Order Line Items.
C . Salesforce does NOT allow more than four objects in a single report type.
D . A report CANNOT contain data from Accounts and Contacts.