Correct option is B
13 + 21 = 34 (Initial difference is 21)
34 + 42 = 76 (The difference 21 is multiplied by 2: 21 × 2 = 42)
76 + 84 = 160 (The difference 42 is multiplied by 2: 42 × 2 = 84)
160 + 168 = 328 (The difference 84 is multiplied by 2: 84 × 2 = 168)
328 + 336 = 664 (The difference 168 is multiplied by 2: 168 × 2 = 336)
Thus, the next number in the series is 664,