Right and left kidneys differ slightly in their location, one is slightly lower than the other one due to the presence of the largest organ of the body.
The kidneys are found in humans in the abdominal space. To take care of the largest gland / organ of the body, the liver, the right kidney is located at a slightly lower level than the left kidney. On the right side of the body, the liver bulges and then tapers to the left.
Hence, the option (C) is the correct choice.
The kidneys are part of the urinary system and regulate the ionic balance of the blood. They are reddish-brown bodies covered by a small, smooth, fibro-brown capsule which can normally be easily removed. On the hilus, where the vessels join and exit, the medial boundary is indented and the ureter emerges. Each kidney has a pale cortex with a darker medulla.
Back muscles and rib cage shield the kidneys from both the back and front sides of the body. Fat tissue, known as perirenal fat, is often found around the kidneys plays a role in protecting the kidneys.
Note: Owing to the broad liver on the right side of the body, the right kidney is positioned slightly lower than the left kidney. The liver is larger to the right and eventually tapers to the left. The kidney lies behind the abdominal cavity peritoneum.