The answer is B. Its B because since its with exponets not linar you have to divide by the number before. For instance, 81 divided by 27 is 3. 27 divided by 9 is 3. 9 divided by 3 is 3. The constant rate would be 3 so you take the choices and divide each and then for B the first number is 243. 243 divided by 81 is 3. so its choice B