Choose the correct order of the given alternative : C-3, E-5, G-7, I-9, ?, ?

The correct answer is: C. O-15, X-24.

The pattern is to add 2 to the previous number to get the next number. So, the next number after 9 is 11, and the next number after 11 is 13. However, after 13, the pattern changes to adding 3 to the previous number. So, the next number after 13 is 16, and the next number after 16 is 19. This pattern continues until the end of the sequence.

Here is a table showing the sequence:

Number | Letter
——- | ——–
3 | C
5 | E
7 | G
9 | I
11 | O
13 | K
16 | M
19 | X
22 | Y
25 | Z

Option A is incorrect because X comes before M in the alphabet.

Option B is incorrect because K comes before M in the alphabet.

Option D is incorrect because M comes before K in the alphabet.