2−1−4 forms a logical sequence as the harm mentioned in 2 is explained in 1 and 4. 5−3 forms a logical sequence as the trend mentioned in 3is referencing the willingness of parents to pay for extra lessons mentioned in5. 2 is a better opening line than 5 as it introduces the main point discussed in the passage. Hence, the required sequence is 2−1−4−5−3.