2. Given the sequence: $4,5,6,7,8,9,13,14,15$, $25,26,27, \cdots$, according to its inherent pattern, the 16th number should be ( ).
(A) 93
(B) 95
(C) 97
(D) 99
2. C

In this sequence, every three consecutive natural numbers can be divided into a group. Starting from the second group, the middle number of each group is twice the first number of the previous group. Therefore, the 5th group should be 49, 50, 51, and the 6th group should be 97, 98, 99.