|q⟩ Bad Qubits

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Multiple choice
A two-qubit product state has rho_AB = rho_A (x) rho_B (Kronecker product), with rho_A = diag(0.8, 0.2) and rho_B = diag(0.5, 0.5). After tracing out subsystem B, what is the (0,0) element of the reduced operator rho_A_reduced?