A student finds the volume of a cork. First, he pours some water into a measuring cylinder and then adds one glass ball. Next, he places the cork and then a second, identical glass ball into the water, as illustrated below. Diagram 1 shows the initial water level. Diagram 2 shows the water level after one glass ball has been added. Diagram 3 shows the water level after the cork and the second glass ball have been added. What is the volume of the cork?
- A$30\,\text{cm}^3$
- B$40\,\text{cm}^3$
- C$50\,\text{cm}^3$
- D$100\,\text{cm}^3$