Explanation:

Correct option:3

Explanation:

The given five three digit numbers given below:

453  619  574  471  372 

Condition: If in each number, all the odd digit is added by 1 and all the even digit is added by 2 then, 

After applying the condition:

454  620  576   472  374

So 374 which was changed from 372 will be the lowest number after mentioned operation.

Hence 372 is the correct answer