Answer: Option C
Step-by-step explanation: In simple words, compound interest refers to the interest that includes previously earned and deposited interest in calculating present interest amount along with the principal value.
In the given case, Rosie and Andy both deposited the same amount of principal with same interest rate. Thus, both will earn the same interest in initial year. However, Rosie withdrawal will not give her interest that she could have earned on the first interest amount.
Hence, from the above we can conclude that the correct option is C .