Our beliefs have many errors, i.e., deviations from truth.
Reducing error is important goal, for which we are willing to pay substantial costs.
The causes of our errors can be seen as ranging from context specific to general trends.
We in fact have many identifiable stable general error trends, in addition to legion context specific causes.
By reflecting on error causes, we can seek ways to adjust our pattens of thought and social institutions to reduce error.
For a substantial fraction of error causes, we can in fact find feasible adjustments.
It is often more cost-effective to seek and implement adjustments for general trends, than for context specific errors.
B. The sentence needs a clearer controlling idea
D that is because it is the information about a period, the place, and the event taht created, influenced, and formed the background to historical records
