Which answer is correct ? Explain why please !!

-dawn is 3 years older than sara
-sara is older than dawn
-dawn age is x
...so if dawns age is 3 years older than sara
then you would subtract
example:
lets say your 14 you have a cuzon that is 11
14-11=3
so that mean that you are 3 years older
hope this makes sense and plz mark brainliest!!!
ask me if you need more help!!