The ratio given is:
4 cups to 5 cakes or,
4:5
From the answer choices, which ever ratio is 4:5 (reduced), that is the correct answer(s).
Let's see one by one:
A.
8 is to 9
NO
B.
12 is to 15, reducing:
12/15 = 4/5
YES
C.
40 is to 45, reducing:
8 is to 9
NO
D.
20 is to 25
reducing, we get
4 is to 5
YES
E.
30 is to 35, reducing,
6 is to 7
NO
Correct answer(s) are B and D