One organism benefits while the other is harmed
First of all, it is not true that all Learning strategies are effective for everyone: some people will learn better with some strategies and others with other strategies. There is also no universal best strategy or strategy combination - people are different and so are the necessary strategies.However, all patterns are useful - they suit the person that employs the pattern
So the correct answer is:
<span>all combinations are useful in contributing to learning success</span>
The answer is C, the piedmont region one