What should come in place of question mark (?) in the following number/alphabetic series9 × 2: 9 × 9 : : 9 × 5 : ?

What should come in place of question mark (?) in the following number/alphabetic series

9 × 2: 9 × 9 : : 9 × 5 : ? 

1. 9 × 6
2. 9 × 7
3. 9 × 8
4. 9 × 4

Answer & Explanation
Answer: Option A
9×2=18
9×9=81
The digits of resultant have interchanged positions therefore,
9×5=45
9×6=54

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What should come in place of question mark (?) in the following number/alphabetic series9 × 2: 9 × 9 : : 9 × 5 : ?
What should come in place of question mark (?) in the following number/alphabetic series9 × 2: 9 × 9 : : 9 × 5 : ?
What should come in place of question mark (?) in the following number/alphabetic series9 × 2: 9 × 9 : : 9 × 5 : ?