Need some understanding why the correct answer is correct - I have few more questions which are really difficult to understand. Will be posting them also.
An IS auditor is reviewing request for proposal (RFP) floated by IT department to procure
services from independent service provider. Inclusion of which of the below clause is MOST
important while floating such RFP?
A. Details about Maintenance plan
B. Details about Proof of Concept (POC)
C. References from other customers
D. Details about BCP
The correct answer is: C. References from other customers - How is this a correct answer, shouldn't it be 

 Details about BCP - it will contain steps about DR also which is really important.
Explanation for C:
Reference from other customers will help IT department to get idea about performance level of
service provider. Checking references is a means of obtaining an independent verification that the
vendor can perform the services it says it can. Other options are important and needs to be
understood before awarding contracts. However, most important clause will be references from
other customers.