Refer to the given number, symbol series and answer the question that follows. Counting to be done from left to right only. (All numbers are single-digit numbers only.)
(Left) 9 7 * 8 6 4 = 3 1 4 @ 5 8 # 2 9 % 3 6 8 7 & 1 3 + 4 5 (Right)
How many such symbols are there each of which is immediately preceded by an odd number and also immediately followed by an even number?
AThree
BOne
CNone
DTwo