When one tries to solve a problem by using a variety of strategies and eliminating those that do not work, one is using:
A) an algorithm.
B) insight.
C) trial and error.
D) a heuristic.

Trial and error refers to a process where in experimenting is done using various methods to arrive at the most successful answer.

Explain

Option C is the correct answer that best describes how number of strategies are used after eliminating the ones that don't work to arrive at a solution. this method 'Trial and Error' method attempts in accomplishing correct answer after trying various means and strategies. this process gets repeated until and unless correct one is found.

C) trial and error.

Explanation:

Trial and error is a technique of problem-solving in which repeated attempts are made to get at a solution. In this technique we adopt a method, seeing if it successful to solve the problem and if not we move to a new method. This process will continue until a solution is attained. It is a basic learning method essentially used by all organisms to learn new behaviors.

answer; the confederacy could afford to move a large number of prisoners hundreds of miles but could not afford to fee and house the prisoners;