Answer: its c
Explanation: im 99.9% sure
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.
Kagan think Americans should be patriotic to be able to sustain America through worst times. Patriotism would also ensure that America has selfless individuals who will heed the need of others and work toward the common good, and defend America when defense is needed.