In the below series, identify what can come in place of “?”C2, F5, I11, L17, ?, R31, U41, X47

In the below series, identify what can come in place of “?”C2, F5,

1.	In the below series, identify what can come in place of “?”C2, F5, I11, L17, ?, R31, U41, X47
A.	O25
B.	Q23
C.	Q21
D.	O23
Answer» E.