my sister's birthday is in a few weeks and i would like to buy her a new vase to keep fresh flowers in her house. She often forgets to water her flowers and needs a vase that holds alot of water. In a catalog there are three vases available and i want to purchase the one that can hold the most water . The first vase is a cylinder with a diameter 10cm and height 40cm. the second vase is a cone with a base diameter 16cm and hight 45cm. The third vase is a sphere with diameter 18cm.