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The state transition diagram for the logic circuit shown is
Correct Option: D
Truth-table for D-type FF 
when A = 0, Y = X0 = Q
A = 1, Y = X1 = Q,
when
Q = 0, A = 0, Y = X0 = Q = 1
then, D = 1, Qn+1 = 1.
Q = 0, A = 1, Y = X1 = 0
then, D = 0, Qn+1 = 0
Q = 1, A = 0, Y = X0 = 0
then, D = 0, Qn+1 = 0
Q = 1, A = 1, Y = X1 = 1
then, D = 1, Qn+1 = 1.
Hence, state diagram will be as in fig.(d).
