Which Statement Is True About the Reliability of Secondary Data

Which statement is true about the reliability of secondary data while conducting market research?

A) The data in less developed countries are particularly prone to being less positive in nature when reported by these countries.
B) Reliability of data remains unaffected by the prevailing tax structures in countries.
C) Official statistics are sometimes too optimistic, reflecting national pride rather than practical reality.
D) Economic data about less developed countries are more reliable when reported by these countries.
E) Willful errors in the reporting of marketing data are predominantly absent in most industrialized countries.