Which type of isomerism is observed between `I` and `II`?
`underset((I))(CH_(3)-CH_(2)-underset(O)underset(||)C-OCH_(3))`, `underset((II))(CH_(3)-underset(O)underset(||)C-OC_(2)H_(5))`
A. Functional isomerism
B. Metamarism
C. Position isomerism
D. Stereoisomerism