need explanition please

8. Two substances A and B react with each other. In 33 minutes, A is 50% consumed. After a total of 66 minutes, A is 75% consumed. Changing the concentration of B has no effect on the results. Which statement is true about the rate law of this reaction? A. This reaction is zeroth order in both A and B. B. This reaction is 1 st order in both A and B. C. This reaction is 2 nd order in both A and B. D. This reaction is 1st order in A and zeroth order in B. E. This reaction is 2 nd order in A and zeroth order in B