Answer:C. Incumbents provide accurate information, but they may have an incentive to exaggerate what they do to appear more valuable to the organization.
Explanation:The Information from external observers are very vital to Organisational success,observers are external partners to the business or organisation,it should be used to supplement what information is gotten from the incumbents because sometimes incumbents may have an incentive to exaggerate what they do to appear more valuable to the organization,which will send wrong signals and affect the business harshly or adversely.