PxQ means 'P is the mother of Q'
P + Q means 'P is the brother of Q'
P - Q means 'P is the sister of Q'
P÷Q means 'P is the father of Q'
Which of the following shows 'A is the maternal uncle of B'?
AA ÷ C x D + B
BA x E ÷ D + B
CA + E ÷ B - C
DA + C x D - B