Answer:
The fourth option is correct.
Explanation:
In Account A the final balance after each year increases by a constant amount of $2 and in Account B, the final balance after each year increase by variable amounts and it increases by a constant ratio each year which is 2.
Therefore, we can conclude that the annual increase in Account A remained constant each year, but the annual increase in Account B increased by a constant ratio each year.
Therefore, the fourth option is correct. (Answer)