What is required to access dynamic study modules?

Dynamic study modules functions by constantly evaluating the activity and performance, and then utilizing analytics and data to offer personalized content in actual time to reinforce the concepts, which target the specific strengths and weaknesses of each student.  

The dynamic study modules utilize research from the fields of neurology, cognitive psychology, and game studies to provide a specifically efficient system of learning.  

With the help of a highly personalized, algorithmically mediated procedure, the dynamic study modules spontaneously evaluate the functioning and offer supplementary practice in the fields where one struggles the most.  

The assessment of each dynamic study module is performed with the help of a smartphone, computer, or tablet, and encourages quick learning and long-term retention.  

answer; i believe is(b)converging

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.