Which of the Following Statements Is/are True About Historical/comparative Analysis

Multiple Choice

Which of the following statements is/are true about historical/comparative analysis?

A) It is comparative in that it seeks to discover common patterns that recur in different times and places.
B) Primary sources for raw data might include old letters, diaries, or lectures.
C) Flaws might exist in both primary as well as secondary sources.
D) Even official government records might be biased.
E) All of these.