When it comes to the different combinations of learning patterns, it is true that all combinations are useful in contributing to learning success. some combinations are far more useful than others in contributing to learning success. many combinations are actually detrimental to learning success. there is one specific combination that works best for all people, if they ll just apply it.

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: 
all combinations are useful in contributing to learning success

Iwould say the answer would be b