The answer is letter B.
The bladder is a part of the excretory system responsible for holding fluids and excreting excess fluids in the body. It may contain salt, sugar, and other forms of materials that are not needed by the body. This organ expands and shrinks based on the amount of fluid that a person has taken into the body. It can double in size when fluid is not excreted the moment the sensation of urine passes your system. If this organ's ability to function properly is hampered, the body may be poisoned because of the excess dirt/debris stuck inside.