Verified Answer :

The answer to your problem is a. 3:4

To start with you need to know what the original ratio is. It would be 9:12.
Then you need to simplify it.Find the HCF of both numbers. It is 3.
Divide both sides by 3.
9/3 = 3
12/3 = 4
The simplifies version is 3:4 therefore the answer is A.

Hope This Helps You!
Good Luck Studying :)

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