WAEC Biology 2022 Question 17

The diagram is an illustration of some parts of a mammalian ear.
Which of the parts are correctly grouped?
A. Inner ear: I, IV; Middle ear: III; Outer ear: II
B. Inner ear: III; Middle ear: II, IV; Outer ear: I
C. Inner ear: I; Middle ear: II; Outer ear: III, IV
D. Inner ear: II; Middle ear: I, III; Outer ear: IV

1. A.A
2. B.B
3. C.C
4. D.D