The correct option is B 3n + 1
4, 7 , 10, 13, ....
First term, 4 = 3(1) + 1.
Second term, 7 = 3(2) + 1
Third term, 10 = 3(3) + 1
Fourth term, 13 = 3(4) + 1 and so on.
So, each term in the pattern is one more than multiples of 3.
Hence, the pattern can be represented by 3n + 1 (where n = 1, 2, 3, ....).