Refer to the following series and answer the question (all numbers are single digit numbers only).
(Left) 1 8 7 2 2 4 9 5 3 2 3 3 8 4 7 2 5 6 7 4 9 (Right)
How many such even digits are there each of which is immediately preceded by an odd digit and also immediately followed by a perfect square?
AThree
BOne
CFour
DTwo