The correct answer is option 'A', the heart is located in our chest.

Explanation:

The chest, also known as the thoracic cavity, is situated in the upper part of the body between the neck and the abdomen. It is protected by the ribcage and contains several important organs, including the heart, lungs, and major blood vessels.

1. The Heart:
The heart is a vital organ that pumps blood throughout the body. It is located in the middle of the chest, slightly to the left. The heart is responsible for supplying oxygen and nutrients to all the cells in the body and removing waste products. It is made up of cardiac muscle and is divided into four chambers - two upper chambers called atria and two lower chambers called ventricles.

The heart is connected to blood vessels called arteries and veins, which carry blood to and from the heart. The main artery that carries oxygenated blood from the heart to the rest of the body is called the aorta, while the main veins that carry deoxygenated blood back to the heart are called the superior and inferior vena cava.

2. The Lungs:
Although not mentioned in the options, it is worth noting that the lungs are also located in the chest. They are responsible for breathing and the exchange of oxygen and carbon dioxide. The lungs are situated on either side of the heart and are protected by the ribcage.

3. Other Organs:
The kidneys, small intestine, and stomach mentioned in the options are not located in the chest. The kidneys are situated in the abdominal cavity, while the small intestine and stomach are part of the digestive system and are located in the abdominal region below the diaphragm.

In conclusion, the heart is located in our chest, and it plays a crucial role in circulating blood throughout the body.