The question really contradicts itself. The superior chambers are the atria, but they are receiving chambers. The left ventricle is a discharging chamber, but is inferior. I would go with the left ventricle. I'm working on the same paper in anatomy. Ask your teacher to be completely sure.
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left ventricle
The right atrium is the upper chamber of the right side of the heart. It is located superior to the left ventricle.
the left atrium.
The left ventricle is the largest and most muscular chamber of the heart.
The lower left chamber of the heart is called the left ventricle. It is thick and muscular hence manifests a stronger heart beat.
The left ventricle
The human heart has four chambers, two superior atria and two inferior ventricles. The atria are the receiving chambers and the ventricles are the discharging chambers. The left ventricle, feed through the bicuspid valve (mitral valve), pumps blood out to the body.
The left atrium
left ventricle
Left ventricle
The left ventricle (the lower chamber on the left side of your heart).