Your answer is D){28, 42, 56, 70, 84}
To answer this question you just have to make sure the amount he pays is a multiple of 7.If you know you times table then this should be easy
Times table of 7:
7,14,21,28,35,42,49,55,63,70,77,84.
Now you just need to find an answer choice who has these numbers.Lets check it out!
A) 11 isn't a multiple of 7
B) 56 isn't a multiple of 7
C) None of these are multiples of 7 except 7 so this is also incorrect
D) This is correct because they are all multiples of 7
Hope this makes sense.