Given sequence: 2, 1, 13, 34, 106, ?

The pattern in this sequence can be determined by looking at the differences between consecutive terms.

The differences between the terms are:

1st difference: 1, 12, 21, 72, ?

2nd difference: 11, 9, 51, ?

3rd difference: -2, 42, ?

Based on the pattern in the differences, we can determine the missing term.

1st difference: The first difference increases by 11 each time:

1 + 11 = 12

12 + 11 = 23

23 + 11 = 34

34 + 11 = 45

2nd difference: The second difference alternates between decreasing by 2 and increasing by 42:

11 - 2 = 9

9 + 42 = 51

3rd difference: The third difference increases by 44 each time:

2 + 44 = 46

46 + 44 = 90

Therefore, the missing term in the sequence is 90.

However, none of the given options match 90.

Alternative approach:

Another way to solve this problem is to look for a pattern in the ratios between consecutive terms.

The ratios between the terms are:

1/2, 13/2, 34/13, 106/34, ?

Simplifying the ratios, we get:

1/2, 6.5, 2.6154, 3.1176, ?

Looking at the decimal values, we can see that there is no clear pattern.

Therefore, we can conclude that the missing term in the sequence cannot be determined with certainty based on the given information.

None of the given options match the missing term.

Therefore, the correct answer is none of the options provided.