$\begin{array}{1 1} a.Right\; ventricle \to Pulmonary \;aorta \to Tissues \to Pulmonary \;veins \to left \;Ventricle \\ b.Right\; auricle \to Left \;Ventricle \to aorta \to Tissues \to veins \to Right auricle \\ c.Right\; auricle \to Left \;ventricle \to Pulmonary\;aorta \to Tissues \to Right \;auricle \\ d. Left auricle \to Left \;ventricle \to Arteries \to Tissues \to Veins \to Right\; atrium \end{array} $