The answer is "wanting to disguise the truth they have uncovered."
Some historians find this tough. One of the reasons would be because not all people may or may not, like the truth. Some historians would omit some part of the truth to keep violent reactions from the readers or outsiders.
Answer:
B-Darwin's "The Origin of Species"
Of the choices provided the correct one is A. When the Sahara began to dry out the people looked for water.
