A There are different ways of asking for something. We usually ask for something in a polite and indirect way, for example, using: can, could, would you mind if and must.
B There are different ways of asking for something. We usually ask for something in a polite and direct way, for example, using: can, could, would you mind if and should.
C There are different ways of asking for something. We usually ask for something in a polite and demanding way, for example, using: can, could, would you mind if and may
D There are different ways of asking for something. We usually ask for something in a polite and indirect way, for example, using: can, could, would you mind if and may.