3917, 3526, ? , 2857

The difference between the numbers formed by the digits in thousand,hundred and tenth place is equal to the number formed by the digits in thousand and hundredth place.
391-352 = 39
Hence the first three digits of the third term must be 35 less than 352, which is 317.
The difference between the numbers formedlast digit by the digits in thousand,hundred and tenth place is equal to the number formed by the digits in hundredth tens and units place of the preceding term will be the hundred, tens and
units place of a term.
917-391 = 526
Hence the units tens and hundreds place of third term = 526-352 = 174
Hence the missing number is 3174.
Option A is the correct answer.