The correct answer to the question is option-3, which states that there are four chambers in the human heart. The heart is divided into two sides, the left and the right. Each side consists of two chambers, an upper chamber known as the atrium and a lower chamber known as the ventricle. Therefore, on the left side, there is a left atrium and a left ventricle, and on the right side, there is a right atrium and a right ventricle. These four chambers work together to pump blood to different parts of the body. The atria receive blood and the ventricles pump blood out of the heart, enabling the circulation of oxygenated and deoxygenated blood. Therefore, it is important to remember that the human heart consists of four chambers.