(A) The improvements in behavioral patterns are difficult to judge and the methods used to observe improvement were not very comprehensive.
It can be difficult but it doesn't necessarily undermine researcher's arriving at a conclusion
(B) Continual practice of meditation for about a month is required for any beginner to internalize the meditation techniques to experience an influence on chronic behavioral issues.
CorrectParagraph says that researchers concluded after a week that meditation has no effect. However this one says that in order to see improvements you need at least a month
(C) Only some techniques of meditation can be mastered under a training program but medication does its job well upon immediate consumption.
This one doesn't really add any value
(D) Medication is often sufficient for patients of behavioral disorders such as uncontrollable anger and extreme anxiety for overcoming these disorders.
This one is pretty much in line with researchers argument
(E) Before the experiment, the first group had little knowledge about meditation while the second group was asked to read about the general benefits of meditation.
This one doesn't really offer anything tangible