The sequence 6, 10, 18, 34 follows the pattern where each term is 2 more than double the previous term: 6×2+2=14 (but we have 10), so let's recalculate. Actually, the differences are: 10-6=4, 18-10=8, 34-18=16. Each difference doubles (4, 8, 16), so the next difference is 32, making 34+32=66. Option D is correct.