What number continues the sequence?
25, 50, 27, 46, 31, 38, 39, ?  Choose the correct choice from the following choices: A) 21 B) 22 C) 23 D) 24 E) 25
22   22   There are two alternate sequences, the first increases by 2, 4, 8 etc and the second decreases by 4, 8, 16 etc.
<result>B</result>
What number continues the sequence?
25, 50, 27, 46, 31, 38, 39, ?