Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

1. 

1, 1, 2, 6, 24, ?, 720

A. 100
B. 104
C. 108
D. 120

2. 

2, 15, 4, 12, 6, 7, ?, ?

A. 8, 8
B. 8, 0
C. 3, 8
D. None of these

3. 

4832, 5840, 6848, ?

A. 7815
B. 7846
C. 7856
D. 7887

4. 

5824, 5242, ?, 4247, 3823

A. 4467
B. 4718
C. 4856
D. 5164

5. 

2, 8, 16, 128, ?

A. 2042
B. 2046
C. 2048
D. 2056