Although the topic is "simple interest", the task is for compound interests
The amount of money received after three years depends on two variables: interest rate and amount of deposited money.
As far as there is a direct correlation between these two variables, the more money we deposit or the higher the interest rate is, the more money we will get in 3 years.
We know that second amount is twice less. The 1-st condition tells us that interest rate in bank B is less than in bank A, so we deposited less money at less interest rate in bank B, and after 3 years we will get less money, of course, than from bank A. This condition is enough for us to answer the question.
2nd condition only tells us about the difference in amounts but nothing about the interest rates, so it is not sufficient to answer the question.
Answer is A.